cho 25g dung dịch naoh 4% tác dụng với 51g dung dịch h2so4 0,2 m có khối lượng riêng d=1,02g/ml .tính nồng độ % các chất sau phản ứng

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mNaOH= 25. 4%= 1(g)

=> nNaOH= 1/40 = 0,025(mol)

VddH2SO4= mddH2SO4/DddH2SO4= 51/1,02= 50(ml)=0,05(l)

=> nH2SO4= 0,2. 0,05= 0,01(mol)

PTHH: 2 NaOH + H2SO4 -> Na2SO4 + 2 H2O

Ta có: 0,025/2 > 0,01/1

=> NaOH dư, H2SO4 hết, tính theo nH2SO4.

- Chất trong dd sau p.ứ là NaOH dư và Na2SO4.

nNaOH(p.ứ)= 0,01.2= 0,02(mol)

=> nNaOH(dư)=0,025-0,02=0,005(mol)

=>mNaOH=0,005.40= 0,2(g)

nNa2SO4=nH2SO4= 0,01(mol)

=> mNa2SO4= 142. 0,01= 1,42(g)

mddsau= mddH2SO4+ mddNaOH = 51+25= 76(g)

\(\rightarrow C\%ddNaOH\left(dư\right)=\frac{0,2}{76}.100\approx0,263\%\\ C\%ddNa_2SO_4=\frac{1,42}{76}.100\approx1,868\%\)

\(n_{NaOH}=\dfrac{200\cdot4\%}{40}=0.2\left(mol\right)\)

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

\(0.2..............0.1..............0.1\)

\(V_{dd_{H_2SO_4}}=\dfrac{0.1}{0.2}=0.5\left(l\right)\)

\(m_{Na_2SO_4}=0.1\cdot142=14.2\left(g\right)\)

\(m_{dd}=200+510=710\left(g\right)\)

\(C\%_{Na_2SO_4}=\dfrac{14.2}{710}\cdot100\%=2\%\)

Ta có: m_NaOH = 200.4% = 8 (g)

\(\Rightarrow n_{NaOH}=\dfrac{8}{40}=0,2\left(mol\right)\)

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

_____0,2______0,1_______0,1 (mol)

a, \(V_{ddH_2SO_4}=\dfrac{0,1}{0,2}=0,5\left(l\right)\)

b, Chất có trong dd sau pư là Na₂SO₄.

Ta có: m _{dd sau pư} = m _{dd NaOH} + m _{dd H2SO4} = 200 + 510 = 710 (g)

\(\Rightarrow C\%_{Na_2SO_4}=\dfrac{0,1.142}{710}.100\%=2\%\)

Bạn tham khảo nhé!

\(m_{NaOH}=\dfrac{200.4}{100}=8\left(g\right)\\ n_{NaOH}=\dfrac{8}{40}=0,2\left(mol\right)\)

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

a) \(n_{H_2SO_4}=\dfrac{1}{2}n_{NaOH}=\dfrac{1}{2}.0,2=0,1\left(mol\right)\)

\(V_{ddH_2SO_4}=\dfrac{n_{H_2SO_4}}{C_{M_{ddH_2SO_4}}}=\dfrac{0,1}{0,2}=0,5\left(l\right)=500\left(ml\right)\)

b) \(n_{Na_2SO_4}=n_{H_2SO_4}=0,1\left(mol\right)\)

\(m_{Na_2SO_4}=0,1.142=14,2\left(g\right)\)

\(m_{\text{dd sau pư}}=m_{ddNaOH}+m_{ddH_2SO_4}=200+510=710\left(g\right)\)

\(C\%_{Na_2SO_4}=\dfrac{m_{Na_2SO_4}}{m_{\text{dd sau pư}}}.100\%=\dfrac{14,2}{710}.100\%=2\%\)

\(n_{NaOH}=\dfrac{25.4\%}{40}=0,025\left(mol\right)\)

\(n_{H_2SO_4}=0,052.0,2=0,0104\left(mol\right)\)

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

Theo đề: 0,025..........0,0104

Lập tỉ lệ: \(\dfrac{0,025}{2}>\dfrac{0,0104}{1}\) => Sau phản ứng NaOH dư, H2SO4 hết

\(m_{ddsaupu}=25+51=76\left(g\right)\)

\(C\%_{NaOH\left(dư\right)}=\dfrac{(0,025-0,0104\cdot2).40}{76}.100=0,22\%\)

\(C\%_{Na_2SO_4}=\dfrac{0,0104.142}{76}.100=1,94\%\)

PTHH: \(CuSO_4+2NaOH\rightarrow Na_2SO_4+Cu\left(OH\right)_2\downarrow\)

Ta có: \(\left\{{}\begin{matrix}n_{CuSO_4}=0,08\cdot3,5=0,28\left(mol\right)\\n_{NaOH}=0,12\cdot1,5=0,18\left(mol\right)\end{matrix}\right.\)

Xét tỉ lệ: \(\dfrac{0,28}{1}>\dfrac{0,18}{2}\) \(\Rightarrow\) CuSO₄ còn dư

\(\Rightarrow\left\{{}\begin{matrix}n_{Na_2SO_4}=0,09\left(mol\right)=n_{Cu\left(OH\right)_2}\\n_{CuSO_4\left(dư\right)}=0,19\left(mol\right)\\\end{matrix}\right.\) \(\Rightarrow\left\{{}\begin{matrix}m_{Na_2SO_4}=0,09\cdot142=12,78\left(g\right)\\m_{Cu\left(OH\right)_2}=0,09\cdot98=8,82\left(g\right)\\m_{CuSO_4\left(dư\right)}=0,19\cdot160=30,4\left(g\right)\end{matrix}\right.\)

Mặt khác: \(\left\{{}\begin{matrix}C_{M_{Na_2SO_4}}=\dfrac{0,09}{0,08+0,12}=0,45\left(M\right)\\C_{M_{CuSO_4\left(dư\right)}}=\dfrac{0,19}{0,08+0,12}=0,95\left(M\right)\end{matrix}\right.\)

bạn tham khảo :))

/hoi-dap/question/46602.html

mNaOH=25.4%=1g

=>nNaOH=1/40=0,025 mol

nH2SO4=0,2.52/1000=0,0104 mol

      2NaOH              +H2SO4=>Na2SO4        +2H2O

Bđ:0,025 mol

Pứ:0,0208 mol<=0,0104 mol=>0,0104 mol

Dư:4,2.10^(-3) mol

mNaOH dư=4,2.10^(-3).40=0,168g

mNa2SO4=0,0104.142=1,4768g

mdd sau pứ=25+51=76g

C%dd NaOH dư=0,168/76.100%=0,22%

C%dd Na2SO4=1,4768/76.100%=1,943%

Đáp án A

• 0,2 lít NaOH + 0,1 mol AlCl₃ → ↓

Nung ↓ → 0,01 mol Al₂O₃

→ n_Al(OH)3 = 0,02 mol.

• NaOH lớn nhất khi NaOH dư

3NaOH + AlCl₃ → Al(OH)₃↓ + 3NaCl (*)

NaOH + Al(OH)₃ → NaAlO₂ + 2H₂O (**)

Theo (*) n_NaOH = 0,1 × 3 = 0,3 mol; n_Al(OH)3 = 0,1 mol.

Theo (**) n_{Al(OH)3 phản ứng} = 0,1 - 0,02 = 0,08 mol

→ n_NaOH = 0,08 mol.

→ ∑n_NaOH = 0,3 + 0,08 = 0,38 mol

→ C_MNaOH = 0,38 : 0,2 = 1,9M

\(n_{CuSO_4}=\dfrac{15,2}{160}=0,095mol\\ CuSO_4+2NaOH\rightarrow Cu\left(OH\right)_2+Na_2SO_4\)

0,095          0,19              0,095            0,095

\(m_{rắn}=m_{Cu\left(OH\right)_2}=0,095.98=9,31g\\ V_{ddNaOH}=\dfrac{0,19}{2}=0,095l\\ b)C_{M_{Na_2SO_4}}=\dfrac{0,095}{0,04+0,095}\approx0,7M\\ c)Cu\left(OH\right)_2\xrightarrow[t^0]{}CuO+H_2O\)

0,095                 0,095

\(m_{rắn}=m_{CuO}=0,095.80=7,6g\)