How would you Calculate the H3O ion concentration in a solution with pH3 and a solution with pH8?

In a solution, hydrogen ions normally bond with molecules of water, forming H3O+ (hydronium) ions. Thus, the concentration of the hydronium ions will be the same as the concentration of hydrogen ions, which is related to the pH of a solution according to the following equation:

pH = -log[H+] = -log[H3O+]

This equation can be solved for the concentration of hydronium ions:

[H3O+] = 10-pH

Thus, for a solution with a pH of 3, the concentration of hydronium ions will be 10-3 = 0.001 moles/liter, and for a solution with a pH of 8, the concentration of hydronium ions will be 10-8 = 0.00000001 moles/liter.
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Calculate the concentration of all ions present in each of the following solutions of strong electrolytes 5.00 g of NH4Cl in 400.0 mL of solution with proper number of sig figs?

These can not be calculated without knowing what the following  solutions of strong electrolytes are. When this information is  given the answers will be able to be known.

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Which of the following solutions has the highest concentration of hydrogen ions pH10 pH8 pH6 or pH4?

Answer is pH = 4.   Lower the pH, greater is the concentration of H+ ions.

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A solution has a pOH of 1.3 What is the hydronium ion concentration of this solution?

[H3O+] = 10-pH = 10-(14.0-pOH) = 10-(14-1.3) = 10-(12.7) = 2.0 x 10-13 mol/L

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What is the pH of an aqueous solution with the hydronium ion concentration H3O 2 x 10-14 M?

-log(2 X 10^-14 M) = 13. 7 pH ( you could call it 14 )

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