The chemical name of KCN is potassium cyanide. it is chemical compound. K consider positive charge and CN consider negative charge.

Read MoreCoupling Reaction and it’s examples?

What is KCN?

The chemical name of KCN is potassium cyanide. it is a chemical compound. the chemical formula of potassium cyanide is KCN.

It is obtained by the treatment of hydrogen cyanide (HCN) with a solution of potassium hydroxide (KOH). Molecular weight of potassium cyanide is 65.12g/mol.

According to potassium cyanide, K has positive charge and CN has negative charge.

it is Colourless crystalline salt which has no colour. and it is highly toxic and highly soluble in water.

In other world,

potassium cyanide is colourless, crystalline salt which is highly soluble in water. Mostly potassium cyanide is used in gold mining and organic synthesis.

Structure of KCN

structure of KCN

KCN compound name?

The compound name of KCN is potassium cyanide. it is a chemical compound. it is obtained by using hydrogen cyanide (HCN) with a solution of potassium hydroxide (KOH).

Properties of KCN?

  1. The chemical name of potassium cyanide is KCN.
  2. The molecular weight of potassium cyanide is 65.12 g/mol.
  3. Density of potassium cyanide is 1.5g/cm3.
  4. The melting point of potassium cyanide is 634.5°C.
  5. Boiling point of potassium cyanide is 1625°C.

Resonating structure of potassium cyanide?

kcn

You know that, potassium cyanide is an ambident nucleophile. according to resonating structure of potassium cyanide. it can attack through C-atom Or through N-atom. it is clearly show in the resonating structure of potassium cyanide.

Due to presence of polar solvent, what product is formed?

Due to presence of polar solvent, there are two possible products, cyanides and isocyanides is formed.

kcn resonating structure
  • Here, in the presence of the polar solvent, KCN fast ionises to furnish ion. there are two type of bond ate formed such as, C-C bond and C-N bond, so cyanide is formed.

KCN Molar Mass?

Potassium – K+

Cyanide – CN-

If both are combine together it form potassium cyanide – (K + CN = KCN)

For calculate the molar mass of KCN, first write the molecular weight of each element and after, just add them. due to this method you can find molar mass.

Lets go for calculate molar mass of KCN.

First elements is K and molecular weight of k is 39.098.

Second elements is C (carbon) and molecular weight of C is 12.011.

Third elements is N (nitrogen) and molecular weight of N is 14.007.

And if add both of elements, K + C+ N is equal to, 39.098 + 12.011 + 14.007 = 65.116 g/m.

So, the molar mass of KCN is 65.116g/m.

KCN acid or base?

You know that, when weak acid react with stronge base as a result potassium cyanide as a product is formed.

But here, i m going to explain KCN is acid, base, or neutral.

Acid, Base, or Neutral is depend upon ph level.

for example,

PH greater then 7 – this mean, it indicate salt from stronge base and weak acid.

PH less then 7 – this mean, it indicate salt of weak base and stronge acid.

PH will remain neutral at 7 – this mean, it indicate salt of stronge base and stronge acids.

Due to this, potassium cyanide is stronge base and weak acids.

Calculate the PH of a 0.20 of kcn at 25°C?

First Ka for HCl – 6.2 × 10^-10

KCN – K+ + CN-

CN – + H2O – HCN + OH-

Ka Kb – Kw

Kb = Kw/Ka = 1 × 10^ -14 / 6.2 × 10^-10

= 1.6129 × 10^-5

CN – + H2O – HCN + OH-

10.2 +X -X

0.2 – x X X

Kb = [HCN] [OH-] / [CN-]

= (x) (x) / 0.2 – x

1.6129 × 10^-5 = x2 / 0.2

x2 = 3.2258 × 10^6

x = 1.796 × 10^-3 m

2H2O – [OH-] + [H3O+]

Kw – [OH-] [H3O+]

[H3O+] – 1× 10^-14 / 1.796 × 10-3m

5.568 × 10^12m

PH = -log (5.568×10-12m)

= 11.25

So, PH is – 11.25

Application of potassium cyanide

  1. It is mostly use in gold, silver industry.
  2. Uses in chemical synthesis.
  3. Uses in the preparation of chemical compound such as, carboxylic acid.
  4. Uses in gold mining process.

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