Question

in chemistry, the ph of a solution is defined to be ph = - log h⁺ where h⁺ is the hydrogen - ion concentration of the solution in moles per liter. distilled water has a ph of approximately 7. a substance with a ph under 7 is called an acid and one with a ph over 7 is called a base. tomato juice has a hydrogen - ion concentration of 10⁻⁴.⁹ moles per liter. find the ph of tomato juice. ph = □

Explanation:

Step1: Recall the pH formula

The formula for pH is $\text{pH}=-\log[H^{+}]$, where $[H^{+}]$ is the hydrogen - ion concentration.

Step2: Substitute the given value

We are given that $[H^{+}]=10^{- 4.9}$ moles per liter. Substitute this into the formula: $\text{pH}=-\log(10^{-4.9})$.

Step3: Use the logarithm property

According to the logarithm property $\log(a^{b}) = b\log(a)$, so $-\log(10^{-4.9})=-(-4.9)\log(10)$. Since $\log(10) = 1$, then $\text{pH}=4.9$.

Answer:

$4.9$