Question

Trung hoa 300 ml dung dich H₂SO₄ 1,5M bang dung dich NaOH 40⁰/₀ 

a) Tinh khoi luong dung dich NaOH can dung

b) Neu thay dung dich NaOH bang dung dich KOH 5,6⁰/₀ (D= 1,045g/ml) thi luong KOH can dung la bao nhieu

Answer 1

\(n_{H_2SO_4}=0.3\cdot1.5=0.45\left(mol\right)\)

\(2NaOH+H_2SO_4\rightarrow Na_2SO_4+H_2O\)

\(0.9..............0.45\)

\(m_{NaOH}=0.9\cdot40=36\left(g\right)\)

\(n_{KOH}=0.9\left(mol\right)\)

\(m_{KOH}=0.9\cdot56=50.4\left(g\right)\)

\(m_{dd_{KOH}}=\dfrac{50.4}{5.6\%}=900\left(g\right)\)

\(V_{ddKOH}=\dfrac{900}{1.045}=861.2\left(ml\right)\)

Answer 2

Giup minh voi