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zhenek [66]
4 years ago
11

A scientist has two solutions, which she has labeled solution a and solution

Chemistry
1 answer:
klio [65]4 years ago
8 0
Let's make ;
A = ounces solution A
B = ounces solution B


total number of ounces: 
A + B = 120

concentration:
0.65A + 0.80B = 0.7(120)

 Substitute A for 120 - B in the second equation to combine them.

0.65(120 - B) + 0.80B = 84
78 - 0.65B + 0.80B = 84
0.15B = 84 - 78
0.15B = 6
B = 6/0.15
 
B = 40 ounces
Then... A = 120 - 40
A = 60 ounces

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Classify the following reactions: HNO3(aq)+NH3(aq)→NH4NO3(aq)+H2O(l) 2Cu(s)+O2(g)→2CuO(s) NaCl(aq)+AgNO3(aq)→NaNO3(aq)+AgCl(s) 2
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- 2LiOH(aq)+H2SO4(aq)→Li2SO4(aq)+2H2O(l): neutralization.

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Explanation:

Hello,

Based on the given reaction and their classification as redox, neutralization or precipitation, one obtains:

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- 2Cu(s)+O2(g)→2CuO(s): redox as both copper's and oxygen's oxydation states change by increasing by 2 and reducing by 2 respectively.

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- 2LiOH(aq)+H2SO4(aq)→Li2SO4(aq)+2H2O(l): neutralization as lithium hydroxide which is a base reacts with sulfuric acid which is an acid to yield lithium sulfate which is a salt.

- CaCl2(aq)+K2CO3(aq)→2KCl(aq)+CaCO3(s): precipitation since both calcium chloride and potassium carbonate are soluble whereas calcium carbonate is not.

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