Question
In: Chemistry
The concentration of hydrochloric acid can be measured by reacting the acid with pure sodium carbonate....
The concentration of hydrochloric acid can be measured by reacting 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 sodium carbonate (FW= 105.9884 ±0.0007) required 42.36 (±0.04) mL of acid, what is the molarity of the acid. Report the value with its absolute uncertainty.
Solutions
Expert Solution
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
queen_honey_blossom answered 2 years agoRelated Solutions
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