155 = 2x -15
170 = 2x
85 = x
She had 85 when she first started.
19 hundreds. 19 time 100 is 1900
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
i think the answer is 482,064?
