The pH of a fruit juice is 4.7. Find the hydronium ion concentration, [Upper H 3 Upper O Superscript plus ], of the juice. Use the formula pHequalsnegative log [Upper H 3 Upper O Superscript plus ].

1.995*10⁻⁵

Explanation:

pH = 4.7

[H₃O⁺] = ?

pH = -log[H₃O⁺]

4.7 = -log[H₃O⁺]

Take the anti-log of both sides,

[H₃O⁺] = 10⁻⁴·⁷

[H₃O⁺] = 1.995*10^-⁵

Explanation:

Given:

pH = 4.7

But,

pH = -log[H3O+]

[H3O+] = 10^-pH

[H3O+] = 10^-4.7

= 1.995 × 10^-5

= 2 × 10^-5 M.