Question

Cho hỗn hợp hai kim loại Na, Mg (lấy dự) tác dụng với dung dịch HSO4. Biết lượng khí H2 thoát ra bằng 5% khối lượng dung dịch H2SO4 Tính nồng độ phần trăm của dung dịch H2SO4?

Answer 1

As it is given that the initial concentration of sulfuric acid is 0.010 M.

Hence, the ICE table for first dissociation of sulfuric acid is as follows.

Initial: 0.010 0 0

Change: -0.010 +0.010 +0.010

Equilibrium: 0 0.010 0.010

When second dissociation of sulfuric acid occurs which is partial then the ICE table will be as follows.

Initial: 0.010 0 0.010

Change: -x +x +x

Equilibrium: 0.010 - x x 0.010 + x

Since, it is given that . Hence, formula for is as follows.

x = 0.0045

Hence, by using the equilibrium concentrations from the table and value of x we get the following.

= x,

= 0.0045 M

= 0.010 - x

= 0.010 - 0.0045

= 0.0055 M

= 0.010 + x

= 0.010 + 0.0045

= 0.0145 M

Step-by-step explanation: