A) Add water to the acid
B) Add acid to the water
C) Add a base to the concentrated acid
D) Add an alkali to the concentrated acid
Correct Answer: B
Solution :When a concentracted acid is dissolved in water, dilute acid is formed and heat is given out (exothermic reaction). For this reason, it is dangerous to add water to acid. To dilute an acid, always add acid to water slowly with constant stirring.
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