CBSE Class 10 Science 2019 · Paper 31/1/2 · Question 6
Identify the acid and base which form sodium hydrogen carbonate. Write chemical equation in support of your answer. State whether this compound is acidic, basic or neutral. Also write its pH value.
Answer
Sodium hydrogen carbonate forms from carbonic acid and sodium hydroxide; it is basic, with pH above 7 (about 8.3).
Acid: carbonic acid, (a weak acid). Base: sodium hydroxide, (a strong base).
Equation:
Nature: sodium hydrogen carbonate is basic, because it is the salt of a strong base and a weak acid.
pH: above ; its solution has a pH of about (in the range to ).
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