Calculate the moles of OH- in the 10.00ml sample.(Hint, moles of OH- at the equivalence point = moles HCI)Your answer should have 4 sig figs.Enter answers in scientific notation using E, as 1.234 E-2 for example.Answer: A student prepares a solution for titration by adding a 10.00 mL aliquot of a solutionsaturated with Ca(OH)2 at 82.9°C to 25.0 mL of deionized water. This solution is titratedwith a standardized 0.01252 M HCI solution. The equivalence point is observed after17.94 mL of the HCI solution has been added.use this data to answer the questions below.

At equivalence point, the number of moles of acid is equal to the number of moles of base. Concentration of HCl solution = 0.01252 M Volume of HCl solution = 17.94 ml = 0.01794 L Number of moles of HCl = Concentration of HCl solution × Volume of HCl solution Number of moles of HCl = 0.01252 × 0.01794 = 0.000225 mol Volume of calcium hydroxide solution to be titrated = 125 ml = 0.125 L Number of moles of calcium hydroxide = number of moles of HCl = 0.000225 mol The concentration of calcium hydroxide solution can be determined as follows: Molarity = Number of moles of CaOH2Volume of solution in LMolarity = 0.000225 mol0.125 LMolarity = 0.0018 MSince calcium hydroxide is a strong base (strong electrolyte), it dissociates completely into calcium ion and hydroxide ion. Number of moles of calcium hydroxide present in 1000 ml solution = 0.0018 mol Number of moles of calcium hydroxide present in 1 ml solution = 1.8 × 10-6 mol Number of moles of calcium hydroxide present in 10 ml solution = 1.8 × 10-5 mol Number of moles of hydroxide ions released from 1 mol calcium hydroxide = 2 mol Number of moles of hydroxide ions released from 1.8 × 10-5 mol calcium hydroxide = 3.6 × 10-5 mol Hence, the number of moles of hydroxide ions in 10 ml sample = 3.600 E-5 (4 significant figures)

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Chemistry

Calculate the moles of OH- in the 10.00ml sample. (Hint, moles of OH- at the equivalence point = moles HCI) Your answer should have 4 sig figs. Enter answers in scientific notation using E, as 1.234 E-2 for example. Answer:

Calculate the moles of OH- in the 10.00ml sample. (Hint, moles of OH- at the equivalence point = moles HCI) Your answer should have 4 sig figs. Enter answers in scientific notation using E, as 1.234 E-2 for example. Answer:

Chemistry

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ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Question

Calculate the moles of OH- in the 10.00ml sample.
(Hint, moles of OH- at the equivalence point = moles HCI)
Your answer should have 4 sig figs.
Enter answers in scientific notation using E, as 1.234 E-2 for example.
Answer:

A student prepares a solution for titration by adding a 10.00 mL aliquot of a solution
saturated with Ca(OH)2 at 82.9°C to 25.0 mL of deionized water. This solution is titrated
with a standardized 0.01252 M HCI solution. The equivalence point is observed after
17.94 mL of the HCI solution has been added.
use this data to answer the questions below.

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