# Acid-Base Chemistry in Aqueous Solutions

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In summary, the question asks for the final hydrogen ion concentration and pH of a solution created by mixing 400 mL of 0.2 M NaOH and 150 mL of 0.1 M H3PO4, given pKa values of 2.12, 7.21, and 12.32. The Henderson-Hasselbach equation is used to calculate the pH, and the solution involves converting .08 mol of NaOH and .015 mol of H3PO4 into H2O. After these initial reactions, the neutralization continues with the remaining .065 mol of NaOH and .015 mol of H3PO4, resulting in the formation of H2O and H2PO4-. The limiting re
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## Homework Statement

What are the final hydrogen ion concentration and pH of of a solution obtained by mixing 400 mL of 0.2 M NaOH with 150 mL of 0.1 M H3PO4? pKa's are 2.12, 7.21, 12.32

## Homework Equations

Henderson-Hasselbach: pH = pKa + log /[a]

## The Attempt at a Solution

0.2 M * .400 L = .08 mol NaOH
0.1 M * .150 L = .015 mol H3PO4
.015 mol of NaOH will be converted into H2O.

.08 mol - .015 mol = .065 mol NaOH
.015 mol H3PO4

I'm not 100% sure what to do after this besides find the molarities and continue on in the same methods but with H2O and H2PO4 -?

Am I headed in the right direction?

Write THREE consecutive reaction equations that occur during phosphoric acid neutralization. Find out how far the neutralization goes (in terms of limiting reagents). After the neutralization ends, what acid and conjugate base pair is present? What concentrations of both?

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## What is an acid?

An acid is a substance that donates hydrogen ions (H+) in a chemical reaction. It has a pH less than 7 and can be identified by its sour taste.

## What is a base?

A base is a substance that accepts hydrogen ions (H+) in a chemical reaction. It has a pH greater than 7 and can be identified by its bitter taste.

## What is the difference between a strong acid and a weak acid?

A strong acid completely dissociates in water, meaning that all of its molecules break apart to form hydrogen ions and anions. A weak acid only partially dissociates, resulting in a lower concentration of hydrogen ions in solution.

## How does pH affect the properties of a solution?

pH is a measure of the concentration of hydrogen ions in a solution. A lower pH (more acidic) solution will have a higher concentration of hydrogen ions, making it more reactive and corrosive. A higher pH (more basic) solution will have a lower concentration of hydrogen ions, making it less reactive.

## How do you calculate the pH of a solution?

The pH of a solution can be calculated using the formula pH = -log[H+], where [H+] is the concentration of hydrogen ions in moles per liter. Alternatively, the pH can also be determined using a pH meter or litmus paper.

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