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Y_Kistochka [10]
3 years ago
10

How many grams of CaCl2 are needed to make 277.8g of a solution that is 31.5% (m/m) in water? Note that mass is not technically

the same thing as weight, but % (m/m) has the same meaning as % (w/w).
Chemistry
1 answer:
Sveta_85 [38]3 years ago
8 0

<u>Answer:</u> The mass of calcium chloride present in given amount of solution is 87.5 g

<u>Explanation:</u>

We are given:

Mass of solution = 277.8 grams

Also, 31.5 % (m/m) of calcium chloride in water. This means that 31.5 g of calcium chloride is present in 100 g of solution.

To calculate the mass of calcium chloride in the given amount of solution, we use unitary method:

in 100 g of solution, the mass of calcium chloride present is 31.5 g

So, 277.8 g of solution, the mass of calcium chloride present is \frac{31.5}{100}\times 277.8=87.5g

Hence, the mass of calcium chloride present in given amount of solution is 87.5 g

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What is the pH of a solution within a solution with pH = 4.50? [H +] = 3.25×10-6 M?
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Answer: 5.48

Explanation:

pH is the negative logarithm of hydrogen ion concentration in a solution.

Mathematically, pH = - log(H+)

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So, to get the pH of the solution with [H +] = 3.25×10-6 M:

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Now we know that the pH of the solution with hydrogen ion concentration of 3.25×10-6 M is 5.48 (i.e slightly acidic)

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6 0
3 years ago
1<br> What is the pH of a substance that has a hydrogen ion concentration of 1.2 x10-2 M2<br> ZpG
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Answer:

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