1)A 13.1 mL volume of 0.107 M NaOH solution reaches the stoichiometric point in
ID: 1049743 • Letter: 1
Question
1)A 13.1 mL volume of 0.107 M NaOH solution reaches the stoichiometric point in the titration of a 25.0 mL aliquot of nitrous acid, HNO2. What is the molar concentration of the HNO2 solution?
Answer to 4 places after the decimal, 0.0__ __ __ M. DO NOT Include units.
2)
In a titration, 25.00 mL of an unknown weak acid required 46.25 mL of a 1.4971 M NaOH solution to reach the stoichiometric point. Find the moles of NaOH to stoichiometric point?
Do not include the unit, mol.
Answer to 3 places after the decimal, 0.0 _ _ mol. DO NOT Include units.
Explanation / Answer
1)
at equivalence point:
mol of NaOH used = mol of HNO2 used
M(NaOH)*V(NaOH) = M (HNO2)*V(HNO2)
0.107 * 13.1 = M* 25.0
M = 0.0561 M
Answer: 0.0561 M
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