Is KCl soluble in water or not is the question that arises in the mind when discussing the substances that are soluble or insoluble in water. KCl – also known as sylvite – is freely soluble in water because of having electrolytic nature.
In KCl, K stands for potassium and Cl stands for chlorine. Both of them when combined form the salt that is known as potassium chloride.
When KCl is dissolved in water, it ionizes completely to generate positive and negative ions. K+ is the potassium ion while Cl- is the negative chloride ion that is produced as a result of the dissolution of KCl in water.
What are electrolytes?
Electrolytes are the compounds that are dissolved in the water they come in contact with it. For example, sodium chloride – NaCl – common table salt is the most important electrolyte that is also completely soluble in water.
1. Electrolytes: Electrolytes have the property of generating positive and negative ions when they undergo any physical or chemical change while coming in direct contact with water.
2. Non- electrolytes: While those substances, that don’t generate positive and negative ions when dissolved, are referred to as nonelectrolytes.
3. Strong electrolytes: Those substances that are 100% dissolved and completely converted into ions are known as strong electrolytes.
4. Week electrolytes: Substances that generate ions but do not convert themselves completely into ions are known as week electrolytes.
How to check the status of an electrolyte?
Although the article is all about the solubility of KCl in water, yet it’s important to know that in which category of substances does the KCl lie for a better understanding of its solubility in water.
How strong or how week an electrolyte is, totally depends upon the electrical conductance of that specific compound. More there are mobile free ions, more is the conductance of electricity from the solution.
To check the electrical conductivity, the voltage is applied to the solution that contains the soluble electrolyte.
Then, by measuring the electrical current flow and also observing the brightness of an electric bulb, one can access that how many free ions are present in the solution.
How does an electrolyte dissolve?
To understand the concept of dissolution of a compound in the solvent, it’s better to understand the actual process that controls the dissolution of a compound.
Ions in the ionic compounds are connected through ionic forces or ionic bonds. When such ionic compounds are dissolved in a polar solvent in which they are soluble, there is a kind of attraction known as ion-dipole forces.
These ion-dipole forces or attractions play a prime role in the dissolution of an ionic compound in the polar solvent.
When KCl is dissolved in water, the ions that are forming KCl get hydrated. Hydration means the potassium and chloride ions are surrounded by water molecules.
Positive and negative ions of water get attracted towards the positive potassium and negative chloride ions of KCl.
Thus, when an ionic compound is dissolved in polar solvents – such as water – the ions that are forming that compound are solvated by water molecules.
Electrolytes are substances that can dissociate into positive and negative ions when coming in contact with the polar solvents. KCl is also an electrolyte and when dissolved in water it dissociates into potassium and chloride ions hence becoming soluble in water.
What is KCl?
KCl is the empirical formula of potassium chloride that is a metal halide. When potassium makes a bond with chlorine it gives rise to potassium chloride.
Potassium chloride is the metal halide where potassium is the metal and chlorine being a halide. When they both are combined give rise to a metal halide known as KCl.
Now the question is, is KCl soluble in water or not? One line answer is yes, KCl is freely soluble in water.
When KCl is dissolved in water, it ionizes to give rise to the original elements in ionic form. Potassium ions and chloride ions are positive and negative ions respectively that are formed by the dissolution of KCl in water.
Potassium chloride is a white compound that is completely odorless and has a crystalline appearance. Some general properties of KCl are given as:
|Molar mass||74.55 gram per mole|
|Melting point||1040 kelvin|
|Solubility||Water, glycerol, alkalies,|
Structure of KCl
The structure of KCl is a crystal lattice structure and in this lattice, each potassium ion is surrounded by six chloride ions. Similarly, each chloride ion is surrounded by 6 potassium ions in the structure.
While, if we look at the structure of the water molecule, it has a V-type structure. The oxygen atom is present at the upper edge and two hydrogen atoms are present as the two legs of V.
Oxygen atom – present at the edge – is a partial negative ion having two lone pairs of electrons on it. Oppositely, hydrogen has a partially positive nature.
KCl, in this case, can be referred to as a formula unit, because of its ionic nature.
When water and KCl come in direct contact with each other, the partially negative oxygen atom attracts the positively charged potassium ion, and potassium gets separated from the chlorine in KCl.
Similarly, negatively charged chloride ion gets attracted towards the positively charged hydrogen of water. K+ and Cl- of KCl get separated due to the external attractions by positive and negative ions of a water molecule.
This is the process of hydration in which both ions of a formula unit are surrounded by water molecules. Ultimately, KCl that came in contact with water is completely dissolved in the water.
KCl dissolved in water – equation
KCl – an electrolyte – when coming in contact with water is completely dissolved in it because of the polar nature of water as a solvent.
KCl is a strong electrolyte and it has no hesitation in separating when dissolved in water. Oxygen and hydrogen of the water molecules are having a partially negative and partially positive nature respectively.
Water molecules surround the KCl when it enters the water, and starts solvation. Surrounding of KCl with water molecules and then the separation of potassium and chloride from one another is referred to as solvation.
Equation of KCl in water is given as:
KCl (s)+ H2O (liq) → K+ (aquesou)+ Cl- (aqueous)
A metal (potassium) and non-metal (chlorine) when combined via the bond form the ionic compound that is KCl. When KCl comes in contact with water, it gets dissolved.
Aqueous in the above-mentioned equation is representing the water because positive potassium ions and negative chloride ions are surrounded and attracted by negative oxygen and positive hydrogen ions of water.
Production of KCl
Other than the question that is KCl soluble in water or not, people also wonder that how KCl is produced. KCl is a metal halide that is not only extracted from minerals such as sylvite, potash, carnallite.
Other than the extraction from salt water, it can also be prepared by crystallization from the solution. Mostly, KCl is manufactured as industrial and agricultural grade potash.
Because of the abundance of KCl in nature and inexpensive preparation, KCl is not so often prepared intentionally. However, if it has to be prepared in the laboratory, it can be manufactured by the combination of potassium hydroxide and hydrochloric acid.
KOH + HCl → KCl + H2O
As KOH is a base and HCl is an acid, this reaction of combining them both to form KCl is an Acid-base neutralization reaction. Thus as a result of this neutralization, a metal halide – KCl – is synthesized.
KCl – also known as sylvite – is either extracted from minerals such as sylvite or potash or can be prepared in the laboratory. In the laboratory, KCl is synthesized by the reaction of KOH – potassium hydroxide – and HCl – hydrochloric acid. Both acid and base when combined, give rise to a neutral polar compound.
Is KCl soluble in oil?
KCl is not soluble in oil at all. The reason is, an ionic compound like KCl can only be dissolved in the polar solvents. Polar solvent has both the positive and negative ends that help to separate the K+ ion and Cl- ion from each other in the KCl.
KCl is freely soluble in water because of the polar nature of water. When KCl is added to water, water molecules surround the KCl.
Partially negative oxygen attracts the positively charged potassium and partially positive hydrogen attracts the negatively charged chloride. This is the process of dissolution.
While talking about oil, oil is non-polar having no charge at all. A polar compound or electrolyte can’t be dissolved in a non-polar solvent. This is the reason KCl is not soluble in oil.
Is NaCl soluble in water?
Although the article is mainly covering the aspects of the solubility of KCl in water and non-polar solvents, some people may want to know either NaCl is soluble in water or not.
This question arises because of the closely similar nature of both KCl and NaCl. Yes! NaCl is also soluble in water and because it is a strong electrolyte, it dissolves 100% when comes in contact with water.
Just like the solubility of KCl, the aqueous solubility of NaCl is also because of its electrolytic nature.
Being an ionic compound, NaCl when comes in contact with the polar solvent like water, completely ionizes to generate sodium and chloride ions. This dissolution is due to the solvation or hydration that is served by water molecules.
The same concept of polarity and electrolytic nature of ionic compounds that have previously been discussed in the upper portion of this article is being applied to the solubility of NaCl in water.
The polar nature of water molecules enables the dissociation of NaCl to generate positive and negative ions.
NaCl is considered as solute and water is considered as a solvent because NaCl is being dissolved and water is acting as a dissolution medium.
Is AgCl soluble in water?
No! it’s very less soluble in water because of its chemical nature.
AgCl is insoluble in water because of its non-polar nature. Although it seems similar in structure and nature to the KCl and NaCl, yet it’s not the same.
AgCl – known as silver chloride – is a white crystalline compound that is formed by the combination of silver and chlorine.
Because silver has a larger size and hence doesn’t make an ionic bond with the chlorine that leads towards the non-polar nature of AgCl.
Frequently asked questions
Several questions may be similar to the question is KCl soluble in water or not. Here, some of them have been tried to answer in the best and brief way for the satisfaction of your queries:
1) Why is KCl soluble in water?
KCl – known as potassium chloride – is the polar chemical compound that is formed by the binding of potassium – a metal – and chlorine – a non-metal.
Water acts as a polar solvent because of the partially positive and partially negative nature of hydrogen and oxygen present in water molecules.
When a polar compound – known as an electrolyte – is dissolved in water, positive and negative ions of water attract the negative and positive components of a polar compound.
This attraction force the compound to be dissolved by separating the basic synthetic elements.
2) What does KCl do in water?
Potassium chloride – KCl – when present in water is helpful in the prevention of swelling. Potassium chloride acts as a temporary clay stabilizer when present in freshwater-sensitive formations.
When potassium chloride is added to the water-based fracturing fluids, it serves as an aid in the prevention of swelling and dislocation of clay components.
It finally results in the reduced formation permeability and great production as compared to the formations without KCl.
3) Is KCl aqueous?
Because of its great solubility in water bodies, KCl is regarded as an aqueous compound. Its an abundantly found polar electrolyte and is best regarded as the second-most soluble compound in the water.
Most soluble compounds – having the solubility even more than KCl is NaCl – commonly known as table salt. It is complete;y dissolved when comes in contact with water.
4) Is KCl an acid or base?
KCl is neither an acid nor a base. It’s a neutral compound that is formed by the combination of an acid and a base. Potassium hydroxide – KOH – is a base while hydrochloric acid – HCl – is an acid.
Of them when combined, an acid-base neutralization reaction occurs and the resultant product is a neutral yet ionic compound known as KCl or potassium chloride.
5) What is the pH of KCl?
While talking about the pH of KCl, it’s clear that KCl is a neutral compound and has a pH of 7.0.
7 is the neutral pH and that is because of the acid-base neutralization reaction during the formation of KCl.
Because KCl has a cation derived from a strong base – KOH – and the anion from a strong acid – HCl – they both neutralize each other and hence do not affect the pH paper.
Is KCl -potassium chloride - soluble in water or not is the question that arises in someone’s mind when discussing the substances that are soluble or insoluble in water.
KCl – which is also known as sylvite – is the chemical formula for potassium chloride that is a freely soluble compound when dissolved in water.
While discussing the structure, in KCl, K stands for potassium and Cl stands for chlorine. Both of the – metal and non-metal - when combined, form the salt that is known as potassium chloride.
Potassium chloride is the metal halide by nature where potassium is the metal and chlorine being a halide. When they both are combined, they give rise to a metal halide that is known as KCl.
When KCl or sylvite is dissolved in water, it ionizes completely to generate positive and negative ions due to hydration.
During this dissolution, K+ is the positive potassium ion while Cl- is the negative chloride ion that is produced as a result of the dissolution of KCl in water. KCl is insoluble in oil because of the non-polar nature of oil.
NaCl is also 100% soluble in water and is the strongest electrolyte being even superior to KCl in order of solubility in water.