Acids, Bases and Salts

                                        SULPHURIC ACID

• Why is H₂SO₄ not a drying agent for H₂S?

Ans)     H₂SO₄ brings about a chemical change as well as change in chemical composition when reacted with H₂S to form S0₂and free sulphur. Hence it is not a drying agent for H₂S.

• Why Sulphuric acid does forms two types of salts with NaOH?

Ans)  Sulphuric acid does forms two types of salts with NaOH since its basicity is 2.

NaOH+H₂SO₄ ---->NaHS0₄+H₂0

2NaOH+H₂SO4---->Na₂SO₄+2H₂0

• Write the Equation for the reaction by which Sulphur dioxide is converted is converted into Sodium Sulphite?

Ans)   S0₂+2NaOH---->Na₂S0₃+H₂O

• Name a gas that can be oxidized to Sulphur?

Ans) H₂S

Equation:   H₂S+H₂S0₄--->S+2H₂0+S0₂

• What are the chemical names given to salts of Sulphurous and Sulphuric Acid?

Ans)  i) Sulphuric Acid-------Sulphate

E.g.     2KOH+H₂S0₄---->K₂SO₄+2H₂O

1. ii) Sulphurous Acid-------Sulphite

E.g.      2NaOH+H₂SO₃----->Na₂SO₃+ 2H₂0

ACIDS, BASES & SALTS

• What is the difference between Alkali and metal Hydroxide?

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• Define Acid/Alkali in terms of Ionisation:

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• Name the ions furnished by Weak Alkali:

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• Name the Hydrogen containing compound which is not an acid:

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• C₂H₅OH & C₆H₂O₆ do not show Acidic while HCl & HNO3 show acidic character:

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• Dry HCl gas does not change the colour of dry litmus. Why?

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• Is PbO2 a base or not? Comment:

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• Universal Indicator solution of different acids produce different colours, but Solution of same acid with different concentration produce different colours. Why?

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• How to Form PbO₂ from Pb & Mg₂CO₃ from MgCl_2?

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• Sodium Hydroxide Sulphate is not an acid but it dissolves in water to give H⁺ Ions, according to Eq. NAHSO₄-----> H⁺ +Na⁺ + SO4^-2

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• Name a substance which changes the blue colour of copper sulphate to white:

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