Finding the hydronium ion concentration

Question

The pH of a fruit juice is 2.4. Find the hydronium ion concentration, [H30+], of the juice. Use the formula pH=-log[H30+].

Use scientific notation. Use the multiplication symbol as needed. Round to the nearest tenth.

Answer 1

The most advanced thing you have to know here is that logx and 10^x are inverses (they undo each other).

Besides that it's just substitution: if the pH is 2.4 you substitute 2.4 for pH

2.4 = -log(x)

-2.4 = log(x)

10^-2.4=x