The ph of lemon juice is approximately 2.40. at this ph, the hydronium ion concentration is closest to which concentration? 4.0 * 10¯3 m 0.38 m 5.6 * 10¯4 m 2.5 * 10¯12 m

pH = - log[H₃O⁺ (aq) ]

here the pH is given as 2.40.

Hence,

2.40 = - log[H₃O⁺ (aq) ]

log[H₃O⁺ (aq) ] = - 2.40

[H₃O⁺ (aq) ] = 3.98 x 10⁻³ M

= 4.0 x 10⁻³ M

Hence, the hydronium ion concentration in juice is 4.0 x 10⁻³ M.

Since, the pH is less than 7, the juice is acidic.