Secure https session masteringchemistry.co -Base Titrations Resources previous l

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Secure https session masteringchemistry.co -Base Titrations Resources previous l 11 of 41 l next A chemist needs to determine the concentration of a solution of nitric acid, HNO3. She puts 855 mL of the acid in a flask along with a few drops of indicator. She then slowly adds ons 0.200 MBa(OH)2 to the flask until the solution turns pink, indicating the equivalence point of the titration. She notes that 235 mL of Ba(oH)2 was needed to reach the equivalence point. centration of a solution using Solution map In this titration, the concentration of base is known and can be used to calculate the unknown acid concentration: ation, an acid (or base) of concentration of base moles of base moles of acid concentration of acid is added to a base (or acid) of ion until the number of moles e equal, a condition called the Part A Since you know the number of How many moles of Ba(OH) are present in 235 mL of 0.200 MTBa(OH)a? H that you added, you can er of moles of OH (or H in Express your answer numerically in moles. tion containing 1 mol of 4.70x10-2 mol Ba(OH) mol of ionizable hydrogen erefore require 2 mol of Submit Hints My Answers Give Up Review Part ation Correct Part B How many moles of HNO3 are present if4.70x10 2 mol of Ba(OH)2 was needed to neutralize the acid solution? Express your answer numerically in moles. Gea mol HNO3 Submit Hints My Answers Give Up Review Part incorrect; Try Again; 3 attempts remaining

Explanation / Answer

Part A

Molarity = no. of moles / volume of solution in Litre

0.200 = n / 0.235

n = 4.7 x 10-2 moles

Part B.

The titration reaction is

2HNO3 + Ba(OH)2 = Ba(NO3)2 + 2H2O

So from the reaction you may see , 1 mole of Ba(OH)2 requires 2 moles of HNO3 for titration .

So 4.7 x 10-2 moles of Ba(OH)2 will require 2 x 4.7 x 10-2

= 9.4 x 10-2 moles of HNO3 for titration

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