How do I calculate the molar concentration of hydrochloric acid if 35.18 of hydrochloric acid was required to neutralize .450g of sodium bicarbonate to a phenolphathalein end point Then calculate mass percent concentration of hydrochloric acid using the molar concentration calculated in previous question and assuming density is 1.01 g

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Asked Oct 18, 2019
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How do I calculate the molar concentration of hydrochloric acid if 35.18 of hydrochloric acid was required to neutralize .450g of sodium bicarbonate to a phenolphathalein end point 

Then calculate mass percent concentration of hydrochloric acid using the molar concentration calculated in previous question and assuming density is 1.01 g 

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Expert Answer

Step 1

Number of moles of HCl required to neutralize 0.450g of sodium bicarbonate is calculated,

NaCl H20CO2
NaHCO HC
Mass
No. of moles of NaHCO
Molar mass
0.450 g
= 5.36x103 mol
84.01 g/mol
One mole NaHCO; reacts with one mole HC
Hence, no.of moles of HCl required = 5.36 x 103 mol
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NaCl H20CO2 NaHCO HC Mass No. of moles of NaHCO Molar mass 0.450 g = 5.36x103 mol 84.01 g/mol One mole NaHCO; reacts with one mole HC Hence, no.of moles of HCl required = 5.36 x 103 mol

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Step 2

Volume of HCl is 35.18 mL = 0.03518 L (1 mL = 0.001L).

Molar conce...

No.of mol
Molarity
Volume(in L
5.36x 103 mol
0.152 mol/L=0.152 M
0.03518 L
Hence, the molar concentration of hydrochloric acid is 0.152M.
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No.of mol Molarity Volume(in L 5.36x 103 mol 0.152 mol/L=0.152 M 0.03518 L Hence, the molar concentration of hydrochloric acid is 0.152M.

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