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Ta có: \(\left\{{}\begin{matrix}n_{CO_2}=\dfrac{2,688}{22,4}=0,12\left(mol\right)\\n_{NaOH}=0,2\cdot2=0,4\left(mol\right)\end{matrix}\right.\) \(\Rightarrow\) Tạo muối trung hòa
NaOH dư nên tính theo CO2
Bảo toàn Cacbon: \(n_{Na_2CO_3}=n_{CO_2}=0,12\left(mol\right)\) \(\Rightarrow m_{Na_2CO_3}=0,12\cdot106=12,72\left(g\right)\)
Ta có: \(n_{CO_2}=\dfrac{2,688}{22,4}=0,12\left(mol\right)\)
\(n_{NaOH}=0,2.2=0,4\left(mol\right)\)
Xét tỉ lệ: \(\dfrac{n_{NaOH}}{n_{CO_2}}=3,33\)
⇒ Pư tạo muối trung hòa Na2CO3.
PT: \(CO_2+2NaOH\rightarrow Na_2CO_3+H_2O\)
____0,12______________0,12 (mol)
\(\Rightarrow m_{Na_2CO_3}=0,12.106=12,72\left(g\right)\)
Bạn tham khảo nhé!
\(n_{CO_2}=\dfrac{3.36}{22.4}=0.15\left(mol\right)\)
\(n_{NaOH}=\dfrac{12}{40}=0.3\left(mol\right)\)
\(T=\dfrac{0.3}{0.15}=2\)
\(\Rightarrow\text{Tạo ra muối trung hòa}\)
\(2NaOH+CO_2\rightarrow Na_2CO_3+H_2O\)
\(0.3...........0.15..............0.15\)
\(m_{Na_2CO_3}=0.15\cdot106=15.9\left(g\right)\)
Ta có: \(n_{CO_2}=\dfrac{3,36}{22,4}=0,15\left(mol\right)\)
\(n_{NaOH}=\dfrac{12}{40}=0,3\left(mol\right)\)
\(\Rightarrow\dfrac{n_{NaOH}}{n_{CO_2}}=2\). Vậy: Pư tạo muối trung hòa Na2CO3.
PT: \(CO_2+2NaOH\rightarrow Na_2CO_3+H_2O\)
___0,15______________0,15 (mol)
⇒ mNa2CO3 = 0,15.106 = 15,9 (g)
Bạn tham khảo nhé!
\(n_{CO_2}=\dfrac{4.48}{22.4}=0.2\left(mol\right)\)
\(n_{NaOH}=\dfrac{8}{40}=0.2\left(mol\right)\)
\(T=\dfrac{0.2}{0.2}=1\)
\(\Rightarrow\text{Tạo muối axit}\)
\(NaOH+CO_2\rightarrow NaHCO_3\)
\(0.2...............0.2............0.2\)
\(m_{NaHCO_3}=0.2\cdot84=16.8\left(g\right)\)
\(n_{CO_2}=\dfrac{7.84}{22.4}=0.35\left(mol\right)\)
\(n_{NaOH}=\dfrac{16}{40}=0.4\left(mol\right)\)
\(T=\dfrac{0.4}{0.35}=1.14\)
\(\Rightarrow\text{Tạo ra 2 muối}\)
\(n_{Na_2CO_3}=a\left(mol\right),n_{NaHCO_3}=b\left(mol\right)\)
\(2NaOH+CO_2\rightarrow Na_2CO_3+H_2O\)
\(NaOH+CO_2\rightarrow NaHCO_3\)
\(\left\{{}\begin{matrix}2a+b=0.4\\a+b=0.35\end{matrix}\right.\)
\(\Leftrightarrow\left\{{}\begin{matrix}a=0.05\\b=0.3\end{matrix}\right.\)
\(m_{Na_2CO_3}=0.05\cdot106=5.3\left(g\right)\)
\(m_{NaHCO_3}=0.3\cdot84=25.2\left(g\right)\)
Ta có: \(\left\{{}\begin{matrix}n_{CO_2}=\dfrac{4,48}{22,4}=0,2\left(mol\right)\\n_{NaOH}=\dfrac{16}{40}=0,4\left(mol\right)\end{matrix}\right.\) \(\Rightarrow\) Tạo muối trung hòa
Bảo toàn Cacbon: \(n_{Na_2CO_3}=n_{CO_2}=0,2\left(mol\right)\) \(\Rightarrow n_{Na_2CO_3}=0,2\cdot106=21,2\left(g\right)\)
tỉ lệ số mol: \(\dfrac{nNaOH}{nCO2}=\dfrac{\dfrac{16}{40}}{\dfrac{4,48}{22,4}}=2\)
=>pư trên chỉ sinh ra sản phẩm muối Na2CO3
pthh: CO2+2NaOH->Na2CO3+H2O
=>nNa2CO3=nCO2=0,2mol=>mNa2CO3=0,2.106=21,2g
vậy muối tan trong dd X có khối lượng 21,2 g
Bài 1:
Ta có: \(\left\{{}\begin{matrix}n_{CO_2}=\dfrac{5,6}{22,4}=0,25\left(mol\right)\\n_{NaOH}=\dfrac{164\cdot1,22\cdot20\%}{40}=1,0004\left(mol\right)\end{matrix}\right.\) \(\Rightarrow\) Tạo muối trung hòa
PTHH: \(CO_2+2NaOH\rightarrow Na_2CO_3+H_2O\)
Vì NaOH dư nên tính theo CO2 \(\Rightarrow\left\{{}\begin{matrix}n_{Na_2CO_3}=0,25\left(mol\right)\\n_{NaOH\left(dư\right)}=0,5004\left(mol\right)\end{matrix}\right.\)
\(\Rightarrow\left\{{}\begin{matrix}m_{Na_2CO_3\left(rắn\right)}=0,25\cdot106=26,5\left(g\right)\\m_{NaOH\left(rắn\right)}=0,5004\cdot40=20,016\left(g\right)\end{matrix}\right.\)
*Các bài còn lại bạn làm theo gợi ý bên dưới
PTHH: \(CO_2+NaOH\rightarrow NaHCO_3\) (1)
\(CO_2+2NaOH\rightarrow Na_2CO_3+H_2O\) (2)
Ta có: \(n_{CO_2}=\dfrac{1,12}{22,4}=0,05\left(mol\right)\)
\(m_{NaOH}=160.1\%=1,6\left(g\right)\Rightarrow n_{NaOH}=\dfrac{1,6}{40}=0,04\left(mol\right)\)
\(\Rightarrow\dfrac{n_{NaOH}}{n_{CO_2}}=0,8\)
⇒ Pư tạo muối NaHCO3.
PT: \(CO_2+NaOH\rightarrow NaHCO_3\)
__________0,04_______0,04 (mol)
⇒ mNaHCO3 = 0,04.84 = 3,36 (g)
Bạn tham khảo nhé!
\(n_{CO_2}=\dfrac{1.12}{22.4}=0.05\left(mol\right)\)
\(n_{NaOH}=\dfrac{160\cdot1\%}{40}=0.04\left(mol\right)\)
\(T=\dfrac{0.04}{0.05}=0.8\)
\(\Rightarrow\text{Tạo muối axit}\)
\(NaOH+CO_2\rightarrow NaHCO_3\)
\(0.04.......................0.04\)
\(m_{NaHCO_3}=0.04\cdot84=3.36\left(g\right)\)
\(n_{CO_2}=\dfrac{2.688}{22.4}=0.12\left(mol\right)\)
\(n_{Ca\left(OH\right)_2}=0.1\cdot1=0.1\left(mol\right)\)
\(T=\dfrac{0.12}{0.1}=1.2\)
=> Tạo 2 muối
\(n_{CaCO_3}=a\left(mol\right),n_{Ca\left(HCO_3\right)_2}=b\left(mol\right)\)
Ta có :
\(a+b=0.1\)
\(a+2b=0.12\)
\(\Rightarrow\left\{{}\begin{matrix}a=0.08\\b=0.02\end{matrix}\right.\)
\(m_{Ca\left(HCO_3\right)_2}=0.02\cdot162=3.24\left(g\right)\)
\(n_{CO_2}=\dfrac{5.04}{22.4}=0.225\left(mol\right)\)
\(n_{Ba\left(OH\right)_2}=0.25\cdot0.5=0.125\left(mol\right)\)
\(T=\dfrac{0.225}{0.125}=1.8\)
=> Tạo ra 2 muối
\(n_{BaCO_3}=a\left(mol\right),n_{Ba\left(HCO_3\right)_2}=b\left(mol\right)\)
Ta có :
\(a+b=0.125\)
\(a+2b=0.225\)
\(\Rightarrow\left\{{}\begin{matrix}a=0.025\\b=0.1\end{matrix}\right.\)
\(m_{Muối}=0.025\cdot197+0.1\cdot259=30.825\left(g\right)\)
Ta có: \(\left\{{}\begin{matrix}n_{CO_2}=\dfrac{5,04}{22,4}=0,225\left(mol\right)\\n_{NaOH}=0,25\cdot1,75=0,4375\left(mol\right)\end{matrix}\right.\) \(\Rightarrow\) Tạo 2 muối
PTHH: \(CO_2+NaOH\rightarrow NaHCO_3\)
a______a________a (mol)
\(CO_2+2NaOH\rightarrow Na_2CO_3+H_2O\)
b______2b________b (mol)
Ta lập được HPT \(\left\{{}\begin{matrix}a+b=0,225\\a+2b=0,4375\end{matrix}\right.\) \(\Leftrightarrow\left\{{}\begin{matrix}a=0,0125\\b=0,2125\end{matrix}\right.\)
\(\Rightarrow\left\{{}\begin{matrix}m_{NaHCO_3}=0,0125\cdot84=1,05\left(g\right)\\m_{Na_2CO_3}=0,2125\cdot106=22,525\left(g\right)\end{matrix}\right.\)
thanks