Question

高一化学常温下,将0.001mol/L的氢氧化钙与0.001mol/L Na2CO3溶液等体积混合(反应后溶液体积变化忽

Answer 1

设氢氧化钙和Na2CO3的体积均为V,则反应后体积为2V,

Ca(OH)2 +Na2CO3 = CaCO3↓ + 2NaOH

0.001V 0.001v 0.002V

∴c(OH￣ )=n/V = 0.002V÷2V = 0.001 mol/L

∴POH = - lgc(OH￣ ) = 3

∴PH = 14 - 3 =11