Sodium hydrogen carbonate (NaHCO _3), also known as sodium bicarbonate or \"baki

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 HCI through this reaction HCl(aq) + NaHCO _3(aq) rightarrow NaCl(aq) + H _2 O(t) + 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 man suffering from indigestion can be considered to be 150. ml., of a 0.063 mu HCI solution. What mass of NaHCO _3 would he need to ingest to neutralize this much HCI? Be sure your answer has the correct number of significant digits.

Explanation / Answer

Given reaction is

HCl + NaHCO3 ----> NaCl + H2O + CO2

1mole 1mole

1mole of NaHCO3 is required to nuetralise one mole of HCl

Given:

Volume of HCl = 150 mL = 0.150 L

Molarity of HCl = 0.063 mol/L

Number of moles of HCl = Molarity * Volume of solution in litres = 0.063 (mol/L) * 0.150 L = 9.45 * 10-3 mol

Number of moles of NaHCO3 required to nuetralize is same as number of moles of HCl present in stomach

so 9.45 * 10-3 mol of NaHCO3 is required  

Molar mass of NaHCO3 = 84 g/mol

Mass of NaHCO3 required = Number of moles of NaHCO3 required * molar mass = 9.45 * 10-3 mol * 84 g/mol

Mass of NaHCO3 required = 0.7938 g

so 0.7938 g of NaHCO3 required to nuetralize acid in stomach

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