Assalamualaikum wr wb kak Mohon bantuannya Nomor 7 dan 8

Jawaban:

7. A. 2

8. E. 13

Penjelasan:

7. H2SO4 => 2 H^+ + SO4^2-

valensi asam ( a ) = 2

[H+] = a . Ma

=> 2 . 0,005

=> 0,01 M ~ 1×10^-2 M

pH = – log [H+]

=> – log 1×10^-2

=> 2 – log 1

=> 2

8. Mr NaOH = 40

mol NaOH = massa / Mr

=> 4 / 40

=> 0,1 mol

V = 1000 ml ~ 1 L

M = n / V

=> 0,1 / 1

=> 0,1 M ~ 10^-1 M

NaOH => Na^+ + OH^-

valensi basa ( b ) = 1

[OH-] = b . Mb

=> 1 . 10^-1

=> 10^-1

pOH = – log [OH-]

=> – log 10^-1

=> 1

pH = 14 – pOH

=> 14 – 1

=> 13