Question

determinati ph urmatoarelor solutii  a)solutie de  hci=0.0001m b)soluttie de hcl care contine 30moli an hcl an 0.3l sol    c)solutie de hcl care contine  1.825 g hcl dizolvate an 5000 cm solutie. 2)determinati ph urmatoarelor solutii  a)solutie de kom    10 la - 2 m b)solutie de nh30.01m 

Answer 1

a)0,0001 M = 10 la -4 M
pH=-lg[HCl]=-lg 10 la -4 =>pH=4
b)cM=nr moli/volum=30*10-3/0,3=>cM=0,1 M
pH=-lg[HCl]=-lg 10 la -1 =>pH=1
c)cM=m HCl/masa molara HCl*volum=1,825/36,5*50=>cM=0,001 M
pH=-lg[HCl]=-lg 10 la -3 =>pH=1

a)pOH=-lg[KOH]=-lg 10 la -2 =>pOH = 2
pH=14-pOH=14-2=>pH=12
b)pOH=-lg[NaOH]=-lg 10 la -2 =>pOH = 2
pH=14-pOH=14-2=>pH=12