tolongin dong , tugas akhir semester banyak banget bingung mau kerja yang mana

2 a). 2L=200 mL
nHCl= g/Mr
7,1/(35,5+1)
7,1/36,5
= 0,194
M= n/v
= 0,194/200
= 0,0009 = 9.10^-4
[H+] = a.M
= 1. 9.10^-4
= 9.10^4
pH= 4-log9 2 c). Ba(OH)2= b.M = 2. 5.10^-2 = 10^-1