Question

từ các hóa chất: NaCl(r), MnO2(r), NaOH(dd), KOH(dd), H2SO4(đặc), Ca(OH)2(r). viết pthh điều chế:

a. HCl

b. nước giaven

c, kali clorat

d. clorua vôi

e. oxi

Answer 1

a.

\(2NaCl+2H_2O\rightarrow2NaOH+Cl_2+H_2\)

\(H_2+Cl_2\rightarrow2HCl\)

b.

\(2NaCl+2H_2O\rightarrow2NaOH+Cl_2+H_2\)

\(2NaOH+Cl_2\rightarrow NaCl+NaClO+H_2O\)

c.

\(6KOH+3Cl_2\rightarrow5KCl+KClO_3+3H_2O\)

d.

\(Ca\left(OH\right)_2+Cl_2\rightarrow CaOCl_2+H_2O\)

e.

\(2KClO_2\rightarrow2KCl+3O_2\)

Answer 2

a)

\(2NaCl+H_2SO_4--->Na_2SO_4+2HCl\)

b)

\(MnO_2+4HCl-->MnCl_2+2H_2O+Cl_2\)

\(NaOH+Cl_2-->NaCl+NaClO+H_2O\)

c)

\(6KOH+3Cl_2--100^oC->5KCl+KClO_3+3H_2O\)

d)

\(Ca\left(OH\right)_2+Cl_2-->CaOCl_2+H_2O\)

e)

\(2KClO_3--to->2KCl+3O_2\)

Answer 3

\(\left(1\right)2NaCl_{\left(r\right)}+H_2SO_{4\left(\text{đ}\right)}\underrightarrow{t^o}Na_2SO_4+2HCl\)

Từ HCl trên ta điều chế Cl2

\(2HCl\underrightarrow{t^o}H_2+Cl_2\)

\(\left(2\right)2NaOH+Cl_2\rightarrow NaCl+NaClO+H_2O\)

\(\left(3\right)6KOH+3Cl_2\rightarrow5KCl+KClO_3+3H_2O\)