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Anton [14]
3 years ago
9

Describe why there are the same numbers of particles in the beginning and at the end of the reaction of iron sulphide

Chemistry
1 answer:
tankabanditka [31]3 years ago
4 0
You still have the same mass <span>because you haven't created or destroyed anything.

Hope this helps :)

</span>
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Determine the pH of a solution of 0.00278 M of HClO4. Report the answer to two digits past the decimal.
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Answer:

The pH of a solution of 0.00278 M of HClO₄ is 2.56

Explanation:

pH is a measure of acidity or alkalinity that indicates the amount of hydrogen ions present in a solution or substance and is calculated as:

pH= - log [H⁺]= - log [H₃O⁺]

On the other hand , a Strong Acid is that acid that in an aqueous solution dissociates completely. In other words, a strong acid completely dissociates into hydrogen ions and anions in solution.

HClO₄ is a strong acid, so in aqueous solution it will be  totally dissociated. Then, the concentration of protons is equal to the initial concentration of  acid and the pH will be calculated:

pH= - log 0.00278

pH= 2.56

<u><em>The pH of a solution of 0.00278 M of HClO₄ is 2.56</em></u>

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