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

Question

Sodium hydrogen carbonate (NaHCO3), also known as sodium bicarbonate or"baking soda", can be used to relive acid indigestion. Acid indigestion is the burning sensation you get in your stomach when it contains too much hydrochloric acid(HCl), which the stomach secrets 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 o the stomach of a man suffering from indigestion can be considered to be 150.mL of a 0.081M HCl solution. What mass of NaHCO3 would he need to ingest to neutralize this much HCl? Be sure your answer has the correct number of significant digits.

Explanation / Answer

Solution:

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

Calculation of moles of HCl

Mol = Volume in L x molarity

n HCl = 0.150 L x 0.081 M =0.0027 mol HCl

From given reaction mol ratio of sodium bicarbonate (NaHCO3) to HCl is 1:1

So we use mol ratio to get moles of sodium bicarbonate required to react completely with HCl

n NaHCO3 = 0.0027 mol HCl x 1 mol sodium bicarbonate / 1 mol HCl

= 0.0027 mol sodium bicarbonate

Calculation of mass in g

Mass in g = Number of moles x molar mass

Mass in g = 0.0027 mol x 84.007 g /mol

=0.22672 g

Mass of sodium bicarbonate required = 0.227 g

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