Ta có nZnCl2 = \(\dfrac{13,6}{136}\) = 0,1 ( mol )
Ta có ndung dịch ZnCl2 = nZnCl2
Ta có Mdung dịch = Mtham gia
= 186,6 + 13,6 = 200,2 ( gam ) => C%dung dịch ZnCl2 = \(\dfrac{0,1\times136}{200,2}\) . 100 \(\approx\) 6,8 %nZncl2=\(\dfrac{m}{M}=\dfrac{13,6}{136}=0,1\left(mol\right)\)
nh2o=\(\dfrac{m}{M}=\dfrac{186,6}{18}=10,37\left(mol\right)\)
pthh: ZnCl2 + 2H2O \(\rightarrow\) Zn(OH)2 + 2HCl \(\Rightarrow\)H2O dư
0,1.... ..... ...... ..... .... 0,1 ....... ...0,2 (mol)
mZn(OH)2=n.M=0,1.99=9,9(g)
mHCl=0,2.36,5=7,3(g)
mdd HCl=13,6+186,6-9,9=190,3(g)
\(\Rightarrow C\%_{ddHCl}=\dfrac{m_{ct}}{m_{dd}}.100\%=\dfrac{9,9}{190,3}.100\%=5,2\%\)