Question

要使100ml 0.1mol/l的Hcl溶液PH值增至7.0时,需加入固体NaoH多少克

Answer 1

pH值增至7.0时,说明发生中和反应完全.

n(HCl)=0.1*0.1=0.01mol

HCl+NaOH=NaCl+H2O

1 1

0.01mol n(NaOH)

n(NaOH)=0.01mol

m(NaOH)=0.01*40=0.4g