AC88
23. M = 5,35 / 53,5 x 1000/200 = 0,5 H+ = √Kw/Kb x M H+ = √10^-14/10^-5 0,5 H+ = √5 x 10^-5 pH = 5 - log √5 (B)
24. Karena mol HCN = mol NaOH --> Hidrolisis M = 5 x 10^-2 / 100 = 5 x 10^-4 M OH- = √Kw/Ka x M OH- = √10^-14/5 x 10^-10 x 5 x 10^-4 OH- = 10^-4 pOH = 4 pH = 10 (E)
25. pH = 9 + log 2 pOH = 5 - log 2 OH- = 2 x 10^-5 2 x 10^-5 = √10^-14/10^-5 x M M = 0,4 M mol = 0,25 L x 0,4 mol = 0,1
H+ = √Kw/Kb x M
H+ = √10^-14/10^-5 0,5
H+ = √5 x 10^-5
pH = 5 - log √5 (B)
24. Karena mol HCN = mol NaOH --> Hidrolisis
M = 5 x 10^-2 / 100 = 5 x 10^-4 M
OH- = √Kw/Ka x M
OH- = √10^-14/5 x 10^-10 x 5 x 10^-4
OH- = 10^-4
pOH = 4
pH = 10 (E)
25. pH = 9 + log 2
pOH = 5 - log 2
OH- = 2 x 10^-5
2 x 10^-5 = √10^-14/10^-5 x M
M = 0,4 M
mol = 0,25 L x 0,4
mol = 0,1
massa = mol x Mr = 0,1 x 82 = 8,2 gram (B)
Semoga Membantu