# PH question, I really don't get this

• night nurse 991
In summary, to find the [H3O+] of acid rain with a pH of 4.23, you can use the equation H3O+/H+ = 10^(-pH) and plug in 4.23 for pH. This results in a concentration of 5.8 x 10^-5.
night nurse 991

## Homework Statement

What is the [H3O+] of acid rain with a pH of 4.23?

pH = -log[H30+]
pOH = -log[OH-]
pH + pOH = 14

## The Attempt at a Solution

the four possible choices are
a. 1.7 x 10^-10
b. 5.8 x 10^-5
c. 2.3 x 10^-4
d. 1.7 x 10^5

You are given the pH and need to calculate the concentration of the $$H_{3}O^+$$ ions. Which equation should you use?

I know I have to use the first one but I don't know how to do the reverse of it

Since pH = -log[H30+] or pH = -log[H+]
H3O+/H+ = 10^(-pH)

Last edited:
But I don't get how to plug it in on my calculator

night nurse 991 said:
But I don't get how to plug it in on my calculator

10^(-pH)
10 to the -pH power.

Oh okay I got the answer thank you so much!

## 1. What is pH?

pH is a measure of how acidic or basic a solution is. It is a scale that ranges from 0 to 14, with 7 being neutral. Solutions with a pH below 7 are considered acidic and solutions with a pH above 7 are considered basic.

## 2. How is pH measured?

pH is measured using a pH meter or pH strips. A pH meter uses a special electrode to measure the concentration of hydrogen ions in a solution, while pH strips use a color-changing indicator to estimate the pH based on the resulting color.

## 3. Why is pH important?

pH is important for many reasons. It affects the properties and behavior of substances, such as their solubility and reactivity. It also plays a crucial role in biological processes, as many enzymes and other molecules are sensitive to changes in pH.

## 4. What is the difference between acidic and basic solutions?

Acidic solutions have a higher concentration of hydrogen ions (H+) than hydroxide ions (OH-), while basic solutions have a higher concentration of hydroxide ions than hydrogen ions. This difference in concentration leads to different chemical properties and reactions.

## 5. How does pH affect living organisms?

The pH of a solution can greatly affect the function of enzymes and other biomolecules in living organisms. Many organisms have specific pH ranges in which they can survive and function properly. Changes in pH can also disrupt the balance of microorganisms in the body, leading to health issues.

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