Question

Q1 why does the flow of acid rain water into a river make the survival of the survival of aquatic life int the river difficult?

Q2 why should water be never added drop wise to concentrated sulphuric acid?

Q3 write balanced equations for the reactions taking place when drive blue crystals of copper sulphate are dropped into concentrated sulphuric acid.

Q4 what is the role of Tartaric acid in baking powder?​

Answer 1

ANS 1: Acid rain water, if mixed with river water, lowers its pH below 5.6, i.e., makes river water acidic. But the living body works normally within a pH range of 7-7.8. That's why flow of acid rain water to river makes the survival of aquatic life in the river difficult.

ANS 2: This is because the reaction between acid and water is highly exothermic and so produces lot of heat. Hence, when water is added to acid, it results in vigorous boiling of the solution and the amount of heat produced is so large that it splashes the acid out of the container, which can result in acid burns.

ANS 3: CuSO4 . 5H2O + conc. H2SO4 (aq.) = CuSO4 (s) + SO2 (g) + H2O

ANS 4: The main role of tartaric acid in baking powder is to avoid the bitter taste by neutralizing the sodium carbonate produced by baking powder.

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