State reasons for the following statements.
a) Dry hydrogen chloride does not turn blue litmus red wherelse diluted hydrochloric acid doe?
b) During summer season , milkman usually adds a very small amount of baking soda to fresh milk.
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Explanation:
a) Dry HCl is in covalent form and does not dissociate to give H⁺ ions. In aqueous solution , HCl dissociates to form the H⁺ and changes the litmus colour because it is the H+ ions that are responsible for colour change.
b) During summer season, more lactic acid is formed. Thus to neutralize the lactic acid, milk man adds small amount of baking soda to fresh milk, as baking soda is basic in nature.
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Answer:
(a) Dry hydrogen chloride does not give hydrogen ions and so it does not act as an acid and does not turn blue litmus red. On the other hand, hydro chloric acid in water gives H+ ions and turn blue litmus red.
(b) because Baking soda does not allow milk to change to lactic acid which makes milk sour.
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