PTHH: \(2AgNO_3+CaCl_2\rightarrow Ca\left(NO_3\right)_2+2AgCl\downarrow\)

Ta có: \(n_{AgNO_3}=\dfrac{1,7}{170}=0,01\left(mol\right)\)

\(\Rightarrow\left\{{}\begin{matrix}n_{AgCl}=0,01\left(mol\right)\\n_{CaCl_2}=n_{Ca\left(NO_3\right)_2}=0,005\left(mol\right)\end{matrix}\right.\) \(\Rightarrow\left\{{}\begin{matrix}m_{CaCl_2}=0,005\cdot111=0,555\left(g\right)\\m_{AgCl}=0,01\cdot143,5=1,435\left(g\right)\\C_{M_{Ca\left(NO_3\right)_2}}=\dfrac{0,005}{0,07+0,03}=0,05\left(M\right)\end{matrix}\right.\)

nCaCl2=0.02(mol)

nAgNO3=0.01(mol)

CaCl2+2AgNO3->Ca(NO3)2+2AgCl

Theo pthh nAgNO3=2nCaCl2

Theo bài ra nAgNO3=0.5 nCaCl2

->CaCl2 dư tính theo AgNO3

nAgCl=nAgNO3->nAgCl2=0.01(mol)

mAgCl2=1.435(g)

nCaCl2 phản ứng:0.005(mol)

nCaCl2 dư=0.02-0.005=0.015(mol)->CM=0.015:(0.03+0.07)=0.15M

nCa(NO3)2=0.005(mol)->CM=0.005:(0.03+0.07)=0.05M

\(n_{CaCl_2}=0,03\times0,5=0,015\left(mol\right)\)

\(n_{AgNO_3}=0,07\times1=0,07\left(mol\right)\)

a) PTHH: CaCl₂ + 2AgNO₃ → Ca(NO₃)₂ + 2AgCl↓

Ban đầu: 0,015.........0,07...............................................(mol)

Phản ứng: 0,015..........0,03................................................(mol)

Sau phản ứng: 0.............0,04........→....0,015...............0,03...(mol)

b) DD A gồm: AgNO₃ dư và Ca(NO₃)₂

Chất kết tủa: AgCl

\(m=m_{AgCl}=0,03\times143,5=4,305\left(g\right)\)

\(m_{AgNO_3}dư=0,04\times170=6,8\left(g\right)\)

\(m_{Ca\left(NO_3\right)_2}=0,015\times164=2,46\left(g\right)\)

\(nCaCl_2=\dfrac{2,22}{111}=0,02\left(mol\right)\)

\(nAgNO_3=\dfrac{1,7}{170}=0,01\left(mol\right)\)

\(CaCl_2+2AgNO_3\rightarrow2AgCl+Ca\left(NO_3\right)_2\)

 1                2                 2             1          (mol)

0,005          0,01              0,01         0,005

LTL : \(\dfrac{0,02}{1}>\dfrac{0,01}{2}\)

=> CaCl2 dư , AgNO3 đủ

\(m_{kt}=mAgCl=0,01.143,5=1,435\left(g\right)\)

c1:

\(m_{\left(muối\right)}=m_{Ca\left(NO_3\right)_2}=0,005.164=0,82\left(g\right)\)

c2:

BTKL:

\(mCaCl_{2\left(đủvspứ\right)}=0,005.111=0,555\left(g\right)\)

\(mCaCl_2+mAgNO_3=mAgCl+mCa\left(NO_3\right)_2\)

0,555      + 1,7             =  1,435   + \(mCa\left(NO_3\right)_2\)

\(\Rightarrow mCa\left(NO_3\right)_2=0,555+1,7-1,435=0,82\left(g\right)\)

Ta có: \(n_{CaCl_2}=\dfrac{2,22}{111}=0,02\left(mol\right)\)

PT: \(CaCl_2+2AgNO_3\rightarrow Ca\left(NO_3\right)_2+2AgCl_{\downarrow}\)

____0,02________________0,02_______0,04 (mol)

a, m _{chất rắn} = m_AgCl = 0,04.143,5 = 5,74 (g)

b, m _muối = m_Ca(NO3)2 + m_AgCl = 0,02.164 + 5,74 = 9,02 (g)

Bạn tham khảo nhé!

30ml = 0,03l

70ml = 0,07l

\(n_{CaCl2}=0,5.0,03=0,015\left(mol\right)\)

\(n_{AgNO3}=1.0,07=0,07\left(mol\right)\)

Pt : \(CaCl_2+2AgNO_3\rightarrow Ca\left(NO_3\right)_2+2AgCl|\)

           1              2                 1                    2

      0,015         0,07             0,015             0,03

Lập tỉ số so sánh : \(\dfrac{0,015}{1}< \dfrac{0,07}{2}\)

                 ⇒ CaCl₂ phản ứng hết , AgNO₃ dư

                ⇒ Tính toán dựa vào số mol của CaCl₂ 

\(n_{AgCl}=\dfrac{0,015.2}{1}=0,03\left(mol\right)\)

⇒ \(m_{AgCl}=0,03.143,5=4,305\left(g\right)\)

\(n_{Ca\left(NO3\right)2}=\dfrac{0,03.1}{2}=0,015\left(mol\right)\)

\(n_{AgNO3\left(dư\right)}=0,07-\left(0,015.2\right)=0,04\left(mol\right)\)

Sau phản ứng : 

\(V_{dd}=0,03+0,07=0,1\left(l\right)\)

\(C_{M_{Ca\left(NO3\right)2}}=\dfrac{0,015}{0,1}=0,15\left(M\right)\)

\(C_{M_{AgNO3\left(dư\right)}}=\dfrac{0,04}{0,1}=0,4\left(M\right)\)

 Chúc bạn học tốt

\(a)CaCl_2+2AgNO_3\rightarrow Ca\left(NO_3\right)_2+2AgCl\\n_{CaCl_2}=\dfrac{11}{111}=0,1\left(mol\right)\\ n_{AgCl}= 2n_{CaCl_2}=0,2\left(mol\right)\\ \Rightarrow m_{AgCl}=0,2.143,5=28,7\left(g\right)\\ b)n_{AgNO_3}=2n_{CaCl_2}=0,2\left(mol\right)\\ n_{Ca\left(NO_3\right)_2}=n_{CaCl_2}=0,1\left(mol\right)\\ CM_{AgNO_3}=\dfrac{0,2}{0,035}=5,7M\\ CM_{Ca\left(NO_3\right)_2}=\dfrac{0,1}{15+35}=2M\)