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hram777 [196]
3 years ago
7

A solution contains the ions ag+ , pb2+ and ni2+. dilute solutions of nacl, na2so4 and na2s are available to separate the positi

ve ions from each other. in order to effect separation, the solutions must be added in which order?
Chemistry
2 answers:
sladkih [1.3K]3 years ago
6 0
 <span>Use the sequence E (NaCl, Na2SO4, then Na2S). Silver is insoluble as a chloride, so it would be removed first, the others (Pb and Ni) are soluble as chlorides(Note; lead chloride is soluble as a hot solution but will ppt when cold), next, PbSO4 is insoluble but NiSO4 is soluble so use Na2SO4 to separate lead from nickel. Lastly, nickel sulfide is insoluble and can be separated and collected.

Hope I helped :)</span>
laila [671]3 years ago
4 0

Answer:

Sequence will be:

NaCl

Na₂SO₄

Na₂S

Explanation:

The silver ions get precipitated on addition of chloride ion as silver chloride.

So we will add NaCl in the first step.

The following reaction will occur.

Ag^{+}+Cl^{-}--->AgCl(s)

Lead and nickel are soluble in sodium chloride (lead chloride and nickel chloride).

Pb^{+2} will get precipitated as lead sulfate and nickel will remain soluble as nickel sulphate is soluble in water.

The reaction will be:

Pb^{+2}+2SO_{4}^{-2}--->PbSO_{4}(s)

Then nickel will be precipitated as sulfide.

The reaction will be:

Ni^{+2}+2Cl^{-} ---->NiCl_{2}(s)

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3 years ago
Balance the following redox equation in acidic solution using the smallest integers possible and select the correct coefficient
romanna [79]

Answer:

Coefficient of H^{+}(aq) is more than 4

Explanation:

Oxidation: Sn^{2+}(aq)\rightarrow Sn^{4+}(aq)

  • Balance charge: Sn^{2+}(aq)-2e^{-}\rightarrow Sn^{4+}(aq)......(1)

Reduction: Cr_{2}O_{7}^{2-}(aq)\rightarrow Cr^{3+}(aq)

  • Balance Cr: Cr_{2}O_{7}^{2-}(aq)\rightarrow 2Cr^{3+}(aq)
  • Balance O and H in acidic medium: Cr_{2}O_{7}^{2-}(aq)+14H^{+}(aq)\rightarrow 2Cr^{3+}(aq)+7H_{2}O(l)
  • Balance charge: Cr_{2}O_{7}^{2-}(aq)+14H^{+}(aq)+6e^{-}\rightarrow 2Cr^{3+}(aq)+7H_{2}O(l).......(2)

[3\times Equation-(1)]+Equation(2) gives balanced equation:

3Sn^{2+}(aq)+Cr_{2}O_{7}^{2-}(aq)+14H^{+}(aq)\rightarrow 3Sn^{4+}(aq)+2Cr^{3+}(aq)+7H_{2}O(l)

So coefficient of H^{+}(aq) is more than 4

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3 years ago
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The motion of particles can be changed by the temperature you put it at.

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Answer:

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Explanation:

From the given information:

For first-order kinetics, the rate law can be expressed as:

\mathsf{In \dfrac{C}{C_o} = -kt}

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current concentration C = 0.05 mg/L

initial concentration C₀ = 3.65 mg/L

\mathsf{In( \dfrac{0.05}{3.65})= -(0.12) t}

㏑(0.01369863014) = -(0.12) t

-4.29 = -(0.12)

t = -4.29/-0.12

t = 35.75 days

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