a. Write a balanced equation for the reaction of trisilicate ion, Si3O84-, with
ID: 740729 • Letter: A
Question
a. Write a balanced equation for the reaction of trisilicate ion, Si3O84-, with H+.b. Which od the anacid components will exhibit more than a one to one mole ratio, when titrated with HCl?
c. Calculate the number of millimoles of HCl that can theoretically be neutralized by a 500 mg Tums Tablet.
d. In performing the ANC measurment on a tums tablet, 29.2 mL of 0.510 M NaOH is needed to reach the endpoint pH of 3.5. Show whether the experimental value of ANC agrees with the therorectical value determined in part c.
e. Determine what volume of 1.0M HCl would be needed to titrate a Tums tablet to the equlivance point.
Explanation / Answer
ANSWER:
b:
Let the change in pH dictate the volume of NaOH added. The pH change should be on
the order of one or two tenths of a pH unit. At the first sign that the pH is changing faster,decrease the NaOH increment. Record all values of volume NaOH solution added and pH.Continue beyond the equivalence point with first smaller and then larger increments as the change decreases Stop when the pH has been at near a pH of 11 for several,consecutive milliliters. Because the pH meter is precise to only 0.02 pH units, there is noneed to boil solutions prior to the equivalence point during potentiometric titrations.Turn offthe pH meter at the end of the titration remove and rinse the the electrodes.
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.