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Substances in Common Use — Science STD 9 — Question

Maharashtra BoardEnglish MediumSTD 9ScienceSubstances in Common Use2 Marks
Question
Baking soda is used to reduce acidity in the stomach.
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Answer

Baking soda is used as a medicine (antacid). When it is taken, it undergoes hydrolysis to give sodium hydroxide in the stomach. Thus, sodium hydroxide neutralizes the hydrochloric acid produced by gastric juice and gives relief to the patient from acidity.

(ii) $NaHCO _3+ H _2 O \longrightarrow NaOH + H _2 O + CO _2 \uparrow$
Baking water Sodium Water
Soda hydroxide
(iii) $NaOH + HCl \longrightarrow NaCl + H _2 O$
Sodium Hydrochloric Sodium water
hydroxide acid chloride

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