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 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

0.057

M

HCl

solution. What mass of

NaHCO3

would she need to ingest to neutralize this much

HCl

? Round your answer to

2

significant digits.

Explanation / Answer

We have the equation
NaHCO3(s) + HCl(aq) --> NaCl(aq) + CO2(g) + H2O(l)

--------------- 150.0 mL
------------------ 0.057M

Molecular weight of NaHCO3 = 84 g/mol

there fore mass of NaHCO3 needed to neutralize the HCl is calculated as follows

0.150 L X ( 0.057 M HCl / 1L) x ( 1mol of NaHCO3/ 1 mol HCl) x ( 84 g NaHCO3/1mol NaHCO3)

= 0.72 g NaHCO3

Therefore

Mass of NaHCO3 = 0.72 g

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