PH等于7.6的水和PH等于6.9的水等体积混合后的PH?
问题描述：
PH等于7.6的水和PH等于6.9的水等体积混合后的PH?
答
PH=7.6 其[OH-]=0.40*10^-6 (mol/L)
PH=6.9 其[OH-]=0.79*10^-7 (mol/L)
等体积混合后：[OH-] = [0.40*10^-6)+(0.79*10^-7 ] / 2
=0.24*10^-6 (mol/L)
则：POH=-Lg(0.24*10^-6 )
=6.6
pH 7.4
答
7.7
答
7.4
答
PH=7.6 其[H+]=5.0*10^-4 (mol/L)
PH=7.9 其[H+]=3.7*10^-4 (mol/L)
等体积混合后：[H+] = [(5.0*10^-4)+(3.7*10^-4) ] / 2
=4.4*10^-4 (mol/L)
则：PH=-Lg(4.4*10^-4)
7.7