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stepan [7]
3 years ago
14

Use the solubility rules from the Lab 4 introduction and your knowledge of qualitative separation schemes from the lab to answer

the following questions. The qualitative analysis experiment you did is actually an abbreviated version of a much larger analysis scheme in which many different cations are separated and identified. Suppose a mixture contains Ag , K , NH4 , Hg22 , Pb2 , Mg2 , Sr2 , Ba2 , Cu2 , Al3 and Fe3 .
(a) Which of the following ions could you separate, by causing them to precipitate, with the addition of HCl?
Ag+ K+ NH4+
Hg22+ Pb2+ Mg2+
Sr2+ Ba2+ Cu2+
Al3+ Fe3+
(b) After the addition of HCl, the above sample is centrifuged and decanted. Which of the following cations remaining in the supernatant could you separate, by causing them to precipitate, with the addition of H2SO4? (Hint: H2SO4 is a source of sulfate ions. Select all that apply.)
Ag+ K+ NH4+
Hg22+ Pb2+ Mg2+
Sr2+ Ba2+ Cu2+
Al3+ Fe3+
Chemistry
1 answer:
cluponka [151]3 years ago
4 0

Answer:

a13+a13

Explanation:

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Answer:

Half life = 79.67 sec

Explanation:

Given that:

k = 8.7\times 10^{-3}\ s^{-1}

The expression for half life is shown below as:-

t_{1/2}=\frac{\ln2}{k}

Where, k is rate constant

So,  

t_{1/2}=\frac{\ln2}{8.7\times 10^{-3}\ s^{-1}}

t_{1/2}=114.94252\ln \left(2\right)\ sec=79.67\ sec

Half life = 79.67 sec

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lesya692 [45]

Answer:

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