D D How is the pka determined in a titration for the removal of a proton in an acid? It is the pH at the equivalence point It is the initial pH of the acid solution It is the pH halfway between equivalence points O The pKa cannot be determined in a titration Question 4 The volume of sodium hydroxide required to reach the equivalence point is 35.69 mL for a monoprotic acid. What is the volume at which the pka is determined? Report your answer to one decimal place. Question 5 The final equivalence point in the cola titration cannot be determined because the sodium hydroxide pH is too low. True False

D D How is the pka determined in a titration for the removal of a proton in an acid? It is the pH at the equivalence point It is the initial pH of the acid solution It is the pH halfway between equivalence points O The pKa cannot be determined in a titration Question 4 The volume of sodium hydroxide required to reach the equivalence point is 35.69 mL for a monoprotic acid. What is the volume at which the pka is determined? Report your answer to one decimal place. Question 5 The final equivalence point in the cola titration cannot be determined because the sodium hydroxide pH is too low. True False

Chemistry

10th Edition

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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Chemistry Question
When 30 .00 mL of 0.1011 M HCl in 50 mL of deionized water is titrated against 0.09889 M NaOH, the pH increases. What is the volume (in mL) of NaOH required to reach the equivalence point and a pH of 7.00? Find the pH when the volume of NaOH added is 0.02 mL less than the volume required to reach the equivalence point. Find the pH when the volume of NaOH added is 0.01 mL less than the volume required to reach the equivalence point. Find the pH when the volume of NaOH added is 0.02 mL more than the volume required to reach the equivalence point. Comment on the significance of the changes in pH values in relation to the increments of sodium hydroxide added when going “through” the end point. Define equivalence point. For a weak base/strong acid titration, is the pH at the equivalence point <, >, or equal to 7?
What would be the molar ratio of cyanic acid (HCNO)/sodium cyanate (NaCNO) buffer having a pH of 4.80 ? [K a(HCNO) = 2.0 × 10 –4] 11.6 mol NaCNO to 1.0 mol HCNO 12.6 mol NaCNO to 1.0 mol HCNO None of the above 13.6 mol NaCNO to 1.0 mol HCNO 10.6 mol NaCNO to 1.0 mol HCNO
Which statement is FALSE regarding the titration of a weak acid with a strong base? HA + OH" → A¨ + H2O O Before the equivalence point, the pH is due to a mixture of HA and A. O Past the equivalence point the pH is due to excess conjugate base, A". O Before strong base is added, the pH is due to the ionization of the weak acid, HA. O At the equivalence point, the pH is due to the hydrolysis of water by the conjugate base, A". O The pH at the equivalence point is basic.
Choose the correct answer, if any
Consider a titration between a strong acid and a weak base. What is the pH at the equivalence point? O PH 7
Select all that are true for a titration at the equivalence point: Group of answer choices The number of moles of acid (ie H2SO4) added are the same as the number of moles of base (ie NaOH) added. The number of moles of hydronium ion added are the same as the number of moles of hydroxide ion added. The indicator is selected in order to have a color change when the equivalence point is reached.
The graph below shows the titration of 9.15 g of a strong acid with 1.00 M NaOH. Which strong acid is it? tr pH 71.5 Volume 1.00 M NaOH Added (mL) O HNO3 O HI HCIO4 HBr
In a weak base with strong acid titration, which of the following is correct? O the equivalence point pH is less than 7 because only the conjugate acid remains the equivalence point pH is less than 7 because the acid is stronger than the base O the equivalence point pH equals 7 because (H3O*) = [OH'] O the equivalence point pH is greater than 7 because the acid is stronger than the base O the equivalence point pH is greater than 7 because only the conjugate base remains
In the titration of a solution of weak monoprotic acid with a 0.1725 M solution of NaOH, the pH half way to the equivalence point was 4.32 . In the titration of a second solution of the same acid, exactly twice as much of a 0.1725 M solution of NaOH was needed to reach the equivalence point. What was the pH half way to the equivalence point in this titration? __pH __pH
A 25. mL sample of a weak acid solution (KA= 4.3×10−4) is titrated with 0.20 M NaOH. 20.0 mL of NaOH are needed to reach the equivalence point What is the pH halfway to the equivalence point? 3.37 5.85 4.16 4.74
Which one of the following titrations is expected to have a pH < 7 at the equivalence point?