Sodium hydrogen carbonate (NaHCO_3), also known as sodium bicarbonate or \"bakin

Question

Sodium hydrogen carbonate (NaHCO_3), also known as sodium bicarbonate or "baking soda", can be used to relieve acid indigestion. Acid indigestion is the burning sensation you get in your stomach when it contains too much hydrochloric acid (HCl), which the stomach secretes to help digest food. Drinking a glass of water containing dissolved NaHCO_3 neutralizes excess HCl through this reaction: HCl (aq) + NaHCO_3(aq) rightarrow NaCl (aq) + H_2O(I) + CO_2(g) the CO_2 gas produced is what makes you burp after drinking the solution. Suppose the fluid in the stomach of a woman suffering from indigestion can be considered to be 150. mL of a 0.020 M HCl solution. What mass of NaHCO_3 would she need to ingest to neutralize this much HCl ? Be sure your answer has the correct number of significant digits.

Explanation / Answer

First, identify how much HCl is added:

V = 150 mL = 0.15 L

mol = MV = (0.02)(0.15) = 0.003 mol of HCl added

since ratio is 1:1

then

mol of HCl = mol of NaHCO3

0.003 mol = mol of NaHCO3

so...

MW of NaHCO3 = 84.007 g/mol

mass = mol*MW =0.003 * 84.007 = 0.252021 g of NaHCO3 is required to neutralize it

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