Carbonic acid (H2CO3) is a weak diprotic acid with Ka1=4.43Ã—10âˆ’7 and Ka2=4.73Ã—10âˆ’11. When sodium bicarbonate (NaHCO3) is...

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Carbonic acid (H2CO3) is a weak diprotic acid withKa1=4.43Ã—10âˆ’7 and Ka2=4.73Ã—10âˆ’11. When sodiumbicarbonate (NaHCO3) is titrated with hydrochloric acid (HCl), itacts as a weak base according to the equation
NaHCO3(aq)+HCl(aq)â†’H2CO3(aq)+NaCl(aq)
Suitable indicators are those that change color within the pHrange for the equivalence point of a specific titration. Theexpected pH at the equivalence point can be calculated usingpKa values. Suitable indicators for use in titratingcarbonic acid or carbonate solutions are methyl orange andphenolphthalein.
Part A
What volume of 0.130 M HCl is required for the completeneutralization of 2.00 g of NaHCO3(sodium bicarbonate)?
What volume of 0.170 M HCl is required for the completeneutralization of 1.50 g of Na2CO3(sodium carbonate)?
A sample of NaOH (sodium hydroxide) contains a small amount ofNa2CO3 (sodium carbonate). For titration to the phenolphthaleinendpoint, 0.190 g of this sample requires 23.98 mL of 0.100MHCl. An additional 0.700 mL of 0.100 M HCl isrequired to reach the methyl orange endpoint. What is thepercentage of Na2CO3 by mass in the sample?

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4.3 Ratings (1066 Votes)

What volume of 0130 M HCl is required for the complete neutralization of 200 g of NaHCO3sodium bicarbonate NaHCO3aq HCl aq NaClaq H2CO3aq First calculate the moles of NaHCO3 in 200 g Number of moles amount in g molar mass 200 g 84007 g mole 0024 moles NaHCO3 and HCl Reacted in 11 therefore the moles of HCl are 0024 moles Molarity number See Answer

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