Sodium hydrogen carbonate NaHCO3, also known as sodium bicarbonate or \"baking s

Question

Sodium hydrogen carbonate NaHCO3, 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 NaHCO3 neutralizes excess HCl through this reaction:

HCl(aq) + NaHCO3 (aq) NaCl (aq) + H2O (l) + CO2 (g)

The CO2 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 0.090M HCl solution. What mass of NaHCO3would she need to ingest to neutralize this much HCl? Be sure your answer has the correct number of significant digits.

Explanation / Answer

HCl(aq) + NaHCO3 (aq) NaCl (aq) + H2O (l) + CO2 (g)

1 mole     1 mole

no of moles of HCl = molarity * volume in L

                            = 0.09*0.15 = 0.0135 moles

From balanced equation

1 mole of HCl react with 1 mole of NaHCO3

0.0135 mole of HCl react with 0.0135 moles of NaHCO3

mass of NaHCO3 = no of moles of NaHCO3 * molar mass

                         = 0.0135*84 = 1.134gm

mass of NaHCO3 is 1.134gm

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