Aim How can we describe the neutralization reaction

Aim: How can we describe the neutralization reaction? Do Now: 1. Take out a calculator and reference tables. 2. Which of the following will react with an acid in a single replacement reaction? Zn, Au, Na, Co 3. Assuming the acid is HCl, write the complete reaction(s) from your answer to number 2 showing the reactants and their products.

Answer to Do Now

What happens when an acid reacts with a base? • When an acid reacts with a base, a salt and water is produced. This type of reaction is called a neutralization reaction. • Example: KOH + HCl H 2 O + HOH • Which is the acid? • Which is the base? • Which is the salt?

Writing Ionic Formulas • Consider the reaction between HCl and Na. OH: HCl(aq) + Na. OH(aq) H 2 O(l) +Na. Cl(l) • How would this formula look if we were to write the ions involved? • Which ions are present on both sides? • These are called spectator ions. If we take out the spectator ions, the remaining part of the formula is called a net ionic equation. The net ionic equation from this formula looks like:

Another way to write this formula… H+(aq) + OH-(aq) H 2 O(l) • Because hydrogen ions exist in solution as H 3 O+, this equation can also be written as H 3 O+(aq) + OH-(aq) 2 H 2 O(l) • All neutralization reaction will have the same net equation. This is because during neutralization the spectator ions will form a salt.

Practice writing neutralization reactions • Write the equation for the neutralization reaction between dilute nitric acid and potassium hydroxide. • (Remember this is a neutralization! We must form a salt and water)

What if we are using diprotic acids and dihydroxy bases? • How many H+ and OH- ions will be if the equation involves diprotic acids and dihydroxy bases? • How many water molecules will be made by these ions? • Example: Ca(OH)2 + H 2 SO 4 2 H 2 O + Ca. SO 4 • What if we have an unbalanced equation? • Example: Mg(OH)2 + HCl H 2 O + Mg. Cl 2

How will we know the amount of acid or base to use in a neutralization reaction? • The amount of moles or mass of the substances should be the same between an acid and a base in a neutralization reaction. • Example: A water solution contains 0. 5 mol of HCl. How much Na. OH should be added to the HCl solution to exactly neutralize it?

Activity/ Homework • Activity – Complete the questions on the back of the sheet. • Homework – Review Book Pages 181 -182 • # 17 -32 odd OR even, • #34 -37, • #38 and 39 (pick 3 from each)