39- Determine the pH during the titration of 38.1 ml of 0.379 M trimethylamine (CH3)3N, (Kb = 6.3x10-5) by 0.379 M HBr a
Posted: Wed Apr 27, 2022 6:55 am
- 39 Determine The Ph During The Titration Of 38 1 Ml Of 0 379 M Trimethylamine Ch3 3n Kb 6 3x10 5 By 0 379 M Hbr A 1 (35.51 KiB) Viewed 36 times
- 39 Determine The Ph During The Titration Of 38 1 Ml Of 0 379 M Trimethylamine Ch3 3n Kb 6 3x10 5 By 0 379 M Hbr A 2 (55.28 KiB) Viewed 36 times
- 39 Determine The Ph During The Titration Of 38 1 Ml Of 0 379 M Trimethylamine Ch3 3n Kb 6 3x10 5 By 0 379 M Hbr A 3 (49.71 KiB) Viewed 36 times
35. The amount of CaCO3 per antacid tablet was determined by dissolving a sample of antacid (0.145 g) in 10.00 mL HCI 0.500 M followed by back titration with 15.0 mL of standardized solution of NaOH with a concentration of 0.250 M. calculate the actual ANC in mmoles/g. Mw CaCO3 100.0869 g/mol O A. 1.25 B. 8.62 O C. 4.31 O D. 10.01
30. A 0.4376 g aspirin tablet was heated gently with 50.00 mL of 0.196 M sodium hydroxide solution. The aspirin reacts according to the equation: C6H4(OCOCH3)COOH(aq) + 2NaOH(aq) -C6H4(OH)COONa(aq) + CH3COONa(aq) + H2O(l) After cooling, the resulting solution was titrated against 0.298 M hydrochloric acid to determine the amount of unreacted sodium hydroxide. The initial burette reading was 1.00 ml while the end burette reading volume of 19.64 mL at the end point. Calculate: the percentage by mass %wlw, of aspirin in the tablet (Molecular weight of aspirin is 180g/mole) A. 87.31 B. 43.66 O C. 21.83 O D. 10.91