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The concentration of hydrochloric acid can be measured by reacting the acid with pure sodium carbonate.                 a)...

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Chemistry

The concentration of hydrochloric acid can be measured byreacting the acid with pure sodium carbonate.

               a) Write the balanced chemical equation for this reaction.

               b) If the complete reaction with 0.8642 (±0.0005) g of sodiumcarbonate (FW= 105.9884 ±0.0007) required 42.36 (±0.04) mL of acid,what is the molarity of the acid. Report the value with itsabsolute uncertainty.

Answer & Explanation Solved by verified expert
4.4 Ratings (879 Votes)

2HCl + Na2CO3 ----> 2NaCl + CO2 +H2O

no of moles of Na2CO3 = weight of substance/Gram molecular weight

                                     = 0.8647/105.9891

                                      = 0.00815 moles

From balanced equation

1 mole of Na2CO3 react with 2moles of HCl

0.00815 moles of Na2CO3 react with = 2*0.00815 =0.0163 moles of HCl

Molarity      = no of moles*1000/volume in ml

                  = 0.0163*1000/42.4

                  = 0.3844±0.0006M

molarity = 0.3844±0.0006M

                       
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