The hydronium ion is H₃O⁺ and its concentration is equivalent to the H⁺ ion concentration. The H⁺ ion concentration is given by:
pH = -log[H⁺]
[H⁺] = 10^(-8.2)
[H⁺] = 6.31 x 10⁻⁹ mole/dm³
The hydronium ion concentration is 6.31 x 10⁻⁹ mole/dm³
Answer:

Step-by-step explanation:
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Determine the number of possible answers
<em>The first question has 4 possible answers</em>
<em>The second has 4 possible answers</em>
<em>The third has 4 possible answers</em>
<em>The fourth question has 4 possible answers</em>
<em>The fifth has 4 possible answers</em>
<em>The sixth question has 4 possible answers</em>
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2(x-2)+(x+3)
=(2x-4)+(x+3)
=2x-4+x+3
=3x-1
How many friends are their without the number of friends you cant answer it so the answer is unknown