N EUTRALIZATION R EACTIONS. Adding a base to an acid neutralizes the acid’s acidic properties. This type of reaction is called a neutralization reaction.

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Presentation transcript:

N EUTRALIZATION R EACTIONS

Adding a base to an acid neutralizes the acid’s acidic properties. This type of reaction is called a neutralization reaction. There are many different acids and bases and being able to predict the results of reactions between them is important.

N EUTRALIZATION R EACTIONS Bakers depend on neutralization reactions to create light, fluffy baked goods. Gardeners and farmers depend on these reactions to modify the characteristics of the soil. Industrial chemists rely on these reactions to produce the raw materials that are used to make a wide variety of chemicals and chemical products.

N EUTRALIZATION R EACTIONS The quantitative reaction between an acid and a base produces an ionic compound (a salt) and water. Acid + Base  A Salt + Water A salt is any ionic compound that is composed of the anion from an acid and a cation from a base. Cation from base HNO 3(aq) + NaOH (aq)  NaNO 3 + H 2 O ( l ) Anion from acid

N EUTRALIZATION R EACTIONS The balanced chemical equation for that reaction showed that 1 mol of nitric acid reacted with 1 mol of sodium hydroxide. If equal molar quantities of nitric acid and sodium hydroxide are used, the result is a neutral (pH 7) aqueous solution of sodium nitrate.

N EUTRALIZATION R EACTIONS In fact, when any strong acid reacts with any strong base in the mole ratio from a balanced chemical equation, a neutral aqueous solution of a salt is formed. Reactions between acids and bases of different strengths usually do not result in neutral solutions.

N EUTRALIZATION R EACTIONS For most neutralization reactions, there are no visible signs that a reaction is occuring. How can you determine that a neutralization reaction is taking place? One way is to use an acid-base indicator.

A CID -B ASE I NDICATORS Operationally, an indicator is a substance that changes colour over a given pH range. Theoretically, an indicator is a weak monoprotic acid—usually one with a complex organic structure. H (indicator) (aq) H + (aq) + (indicator) - (aq)

C ALCULATIONS I NVOLVING N EUTRALIZATION R EACTIONS Suppose that a solution of an acid reacts with a solution of a base. You can determine the concentration of one solution if you know the concentration of the other.

F INDING C ONCENTRATION Problem mL of hydrochloric acid just neutralizes mL of a mol/L solution of sodium hydroxide. What is the concentration of the hydrochloric acid? What is required? [HCl] What is given? Volume of HCl = mL Volume of NaOH = mL [NaOH] = mol/L

F INDING V OLUME Problem What volume of mol/L sulfuric acid is needed to react completely with 37.2 mL of mol/L potassium hydroxide? What is required? Volume of sulfuric acid What is given? [H 2 SO 4 ] = mol/L [KOH] = mol/L Volume of KOH = 37.2 mL