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MrRissso [65]
3 years ago
5

A compound is found to consist of 2.89 g of calcium and 5.11 g of chlorine. what is the percent by mass of calcium in the compou

nd
Chemistry
1 answer:
dexar [7]3 years ago
8 0

To get the percent mass of calcium, first let us compute for the total mass:

total mass = 2.89 g + 5.11 g

total mass = 8 g

 

So the percent mass of calcium is:

% calcium = (2.89 / 8) * 100% = 36.125%

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3 years ago
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Calculate the pH of the following simple solutions:
IceJOKER [234]

Answer :

(1) pH = 1.27

(2) pH = 13.35

(3) The given solution is not a buffer.

Explanation :

<u>(1) 53.1 mM HCl</u>

Concentration of HCl = 53.1mM=53.1\times 10^{-3}M

As HCl is a strong acid. So, it dissociates completely to give hydrogen ion and chloride ion.

So, Concentration of hydrogen ion= 53.1\times 10^{-3}M

pH : It is defined as the negative logarithm of hydrogen ion concentration.

pH=-\log [H^+]

pH=-\log (53.1\times 10^{-3})

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As KOH is a strong base. So, it dissociates completely to give hydroxide ion and potassium ion.

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pOH=-\log (0.223)

pOH=0.65

Now we have to calculate the pH.

pH+pOH=14\\\\pH=14-pOH\\\\pH=14-0.65=13.35

<u>(3) 53.1 mM HCl + 0.223 M KOH</u>

Buffer : It is defined as a solution that maintain the pH of the solution by adding the small amount of acid or a base.

It is not a buffer because HCl is a strong acid and KOH is a strong base. Both dissociates completely.

As we know that the pH of strong acid and strong base solution is always 7.

So, the given solution is not a buffer.

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