A solution produced with two tablets of NaHC0_3 would a solution with just one t

Question

A solution produced with two tablets of NaHC0_3 would a solution with just one tablet of NaHCO_3. a. have the same pH as b. be more basic than c. be more acidic than An arsenate buffer of pH 7.1 would have roughly equal concentrations of which two species? a. H_3AsO_4 and H_2AsO_4^- b. H_2AsO_4^- and HAs0_4^-2 c. HAsO_4^2- and AsO_4^3- d. H_2AsO_4^- and AsO_4^3- In a titration curve where arsenic acid (the analyte) is being titrated with NaOH (the titrant), PH 7.1 would be: a. the midpoint of the first acid dissociation b. the midpoint of the second acid dissociation c. the endpoint of the first acid dissociation d. the endpoint of the second acid dissociation When mixed together, which of the following two solutions could make a buffer? a. 50mL of 0.1 M HC1 and 50mL of 0.1M KOH b. 50mL of O.1M HCI and 100mL of 0.1 M sodium acetate c. 100mL of 0.1 M HCI and 50mL of 0.1 M sodium acetate d. 50mL of 0.1 M acetic acid and 40mL of 0.1 M sodium acetate e. two of the above Which point on the titration curve to the right would correspond to a buffered solution that would buffer best against additional acid? a. A b. B c. C d. D

Explanation / Answer

17. be more basic than

pH of NaHCCO3 is greater than 7

An aqueous solution of sodium bicarbonate would be having a pH value above 7, whatever its concentration. NaHCO3 is a salt of a weak acid, H2CO3, and a strong base,NaOH.

18. H3AsO4 and H2AsO4-

H3AsO4 = 2.25 (pK1)

H2AsO4- = 6.77 (pK) , 11.6 (pK3)

19. the endpoint of the second acid dissociation

after this point pH will start basic

20. two of the above

A buffer solution is one which resists changes in pH when small quantities of an acid or an alkali are added to it.

21. B

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