Hydrocyanic acid is a one type of weak acid. it is colourless liquid.

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What is hydrocyanic acid?

hydrocyanic acid is one type of liquid acid but it is colourless type liquid. it is easy to dissipates. hydrocyanic acid is called a weak acid. the basic chemical formula of this acid is HCN. but whereas, the chemical formula of cyanic acid is HCNO. hydrocyanic acid is decompose slowly to form ammonia as a product. hydrocyanic acid has density 687 kg/m3 and molar mass is 27.0253 g/mol.

Hydrocyanic Acid Properties

Physical

  1. Appearance – pale blue
  2. Hydrogen bond – 1
  3. heat capacity – 35.9 kj -1 Mole-1
  4. Soluble – in water
  5. Chemical formula – HCN
  6. density – 687 kg/m3
  7. Boiling point – 25.6°C
  8. Melting point – -13.4°C
  9. Colour – colourless liquid
  10. Reaction – slowly

Chemical properties

1. HCN acid is one type of weak acid but if it react with strong base NaOH then it give sodium cyanide. It is acid base type reaction.

For example,

When weak acid (HCN) is react with base (NaOH) Sodium hydroxide then it is given sodium cyanide and water as a product.

HCN + NaOH – NaCN + H2O

Where,

Reactant

HCN – weak acid

NaOH – base

Product

NaCN – sodium cyanide (product)

H2O – water (product)

Write the state of (s l g) for each substance is,

HCN (aq) + NaOH (aq) – NaCN (aq) + H2O (l)

Write the ionic equation,

HCN + Na (+) OH(-) – Na (+) CN (-) + H2O

Write the Net ionic equation

HCN + OH (-) – CN (-) + h2O.

Uses

  1. it is windly uses in chemical and textile industry.
  2. it is used for the preparation of sodium cyanide.

Frequently Asked Questions

1. The ka of HCN, is 5.0 ×× 10^(-10). What is the pH of 0.050m HCN(aq)?

basic concept;

You know that HCN is a weak acid. in case of weak acid it is define as,

[H+] = √Ka c

[H+] = √5 × 10^(-10) × 50 × 10^(-3)

= √5×5 10^(-12)

= 5 × 10^(-6)

Now, We will find the value of ph.

pH = -log[H+]

= -log [ 5 × 10^(-6) ]

= 6 – log5

= 6 – 0.67 where, (log5 = 0.67)

pH = 5.33