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Radda [10]
3 years ago
14

A student has two solutions of a substance;Solution-1:25M , 400ml and Solution-2:30M , 300M. What is the molarity of the final s

olutions if these two solutions are mixed?
​
Chemistry
1 answer:
Vlad [161]3 years ago
3 0

Answer:

The molarity of the final solution  is 1.7 M

Explanation:

The parameters given are;

First solution = 400 ml of 1.25 M

Second solution = 300 ml of 2.30 M

Therefore, we have;

First solution contains 400/1000 * 1.25 moles = 0.5 moles of the substance

Second solution contains 300/1000 * 2.30 moles = 0.69 moles of the

Hence the sum of the two solutions contains 0.5 + 0.69 = 1.19 moles of the substance

The volume of the sum of the two solutions = 400 ml + 300 ml = 700 ml

Hence we have the concentration of the final solution presented as follows;

700 ml contains 1.19 moles of the substance

Therefore;

1000 ml will contain 1000/700 * 1.19 = 1.7 moles

The molarity of the final solution = The number of moles per 1000 ml = 1.7 M.

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Answer: The correct matching are as follows:

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Test tube rack is used in the laboratory to hold large number of test tubes that contain chemicals. This makes it easy for one to transport the test tubes. Test tube rack are usually made of plastic or wood.

10.    WIRE BRUSH: Used to clean the inside of test tubes or graduated cylinders.

Wire brush is used to clean the inside of narrow glass wares such as test tubes and cylinder. The wire brush facilitate proper cleaning of the inside of the glasses.

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