Answer variants:
\(CaCO_3 + 2HCl → CaCl_2 + H_2O + CO_2\)
Excess base increases \(OH^-\) ions concentration.
Strength of acid increases
1. A Metal compound reacts with dilute hydrochloric acid to produce effervescence. The gas evolved extinguishes a burning candle. Write a balanced chemical equation for the reaction if one of the compounds formed is calcium chloride
2. How is the concentration of hydroxide ions \(OH^–\) affected when excess base is dissolved in a solution of sodium hydroxide?