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18 Nov 2019
The 2 that are wrong...
A student must make a buffer solution with a pH of 3.5. Determine which of the acids and conjugate bases listed below are the best options to make a buffer at the specified pH. Weak acids: acetic acid, K_a =1, 75 times 10^-5, 5.00 M propionic acid, K_a = 1.34 times 10^-5, 3.00 M phosphoric acid, K_a = 7.52 times 10^-3, 1.00 M formic acid, K_a = 1.77 times 10^-4, 2.00 M Conjugate bases: sodium propionate, CH_3CH_2COONa sodium formate, HCOONa sodium acetate trihydrate, CH_3COONa. 3H_2O sodium dihydrogen phosphate monohydrate, NaH_2PO_4. H_2O The final volume of buffer solution must be 100.00 mL and the final concentration of the weak acid must be 0.100 M. Based on this information, what mass of solid conjugate base should the student weigh out to make the buffer solution with a pH = 3.5? Based on this information, what volume of acid should the student measure to make the 0.100 M buffer solution?
The 2 that are wrong...
A student must make a buffer solution with a pH of 3.5. Determine which of the acids and conjugate bases listed below are the best options to make a buffer at the specified pH. Weak acids: acetic acid, K_a =1, 75 times 10^-5, 5.00 M propionic acid, K_a = 1.34 times 10^-5, 3.00 M phosphoric acid, K_a = 7.52 times 10^-3, 1.00 M formic acid, K_a = 1.77 times 10^-4, 2.00 M Conjugate bases: sodium propionate, CH_3CH_2COONa sodium formate, HCOONa sodium acetate trihydrate, CH_3COONa. 3H_2O sodium dihydrogen phosphate monohydrate, NaH_2PO_4. H_2O The final volume of buffer solution must be 100.00 mL and the final concentration of the weak acid must be 0.100 M. Based on this information, what mass of solid conjugate base should the student weigh out to make the buffer solution with a pH = 3.5? Based on this information, what volume of acid should the student measure to make the 0.100 M buffer solution?
Irving HeathcoteLv2
20 May 2019