Question

Trộn 15ml dd NaOH 2M với 15ml dung dịch H₂SO₄ 1,5M. Tính nồng độ ion trong dd thu được?

mn giúp mik dò đáp án với ạ.

CM Na⁺= 2M

CM OH^- =2M

CM H⁺ =3M

CM SO₄^2- = 1,5M

Thanks.

 

 

Answer 1

\(n_{NaOH}=0.015\cdot2=0.03\left(mol\right)\)

\(n_{H_2SO_4}=0.015\cdot1.5=0.0225\left(mol\right)\)

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

\(0.03..........0.015...........0.015\)

\(n_{H_2SO_4\left(dư\right)}=0.0225-0.015=0.0075\left(mol\right)\)

\(C_{M_{Na^+}}=\dfrac{0.015\cdot2}{0.015+0.015}=1\left(M\right)\)

\(C_{M_{H^+}}=\dfrac{0.0075\cdot2}{0.015+0.015}=0.5\left(M\right)\)

\(C_{M_{SO_4^{2-}}}=\dfrac{0.015+0.0075}{0.015+0.015}=0.75\left(M\right)\)