Trung hòa 400 ml dd H2SO4 1M bằng dd NaOH 0,5 M. a, viết pt phản ứng b, tính thể tích dd NaOH 0,5 M đã dùng ? c, tính nồng độ mol/l dd thu được sau phản ứng mong giúp đỡ nhanh ạ

2 câu trả lời

Bạn tham khảo:

$a/$

$2NaOH+H_2SO_4 \to Na_2SO_4+2H_2O$

$b/$

$n_{H_2OSO_4}=0,4.1=0,4(mol)$

$n_{NaOH}=0,4.2=0,8(mol)$

$V_{NaOH}=\dfrac{0,8}{0,5}=1,6(l)$

$c/$

$V_{dd}=0,4+1,6=2(l)$

$n_{Na_2SO_4}=n_{H_2SO_4}=0,4(mol)$

$CM_{Na_2SO_4}=\dfrac{0,4}{2}=0,2M$

Đáp án:

\(\begin{array}{l}
b)\\
{V_{{\rm{dd}}NaOH}} = 1,6l\\
c)\\
{C_M}N{a_2}S{O_4} = 0,2M
\end{array}\)

Giải thích các bước giải:

\(\begin{array}{l}
a)\\
2NaOH + {H_2}S{O_4} \to N{a_2}S{O_4} + 2{H_2}O\\
b)\\
{n_{{H_2}S{O_4}}} = 0,4 \times 1 = 0,4\,mol\\
{n_{NaOH}} = 2{n_{{H_2}S{O_4}}} = 0,8mol\\
{V_{{\rm{dd}}NaOH}} = \dfrac{{0,8}}{{0,5}} = 1,6l\\
c)\\
{V_{{\rm{dd}}spu}} = 1,6 + 0,4 = 2l\\
{n_{N{a_2}S{O_4}}} = {n_{{H_2}S{O_4}}} = 0,4\,mol\\
{C_M}N{a_2}S{O_4} = \dfrac{{0,4}}{2} = 0,2M
\end{array}\)

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