Warm-Up Do not turn in pH practice!

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Presentation transcript:

Warm-Up Do not turn in pH practice! What is the pH of a solution that is made from 43.7 g of HClO4 in 4.70 L of solution?

Neutralization

Neutralization Reactions Acid (aq) + Base (aq)  Salt (aq) + H2O (l) Water is always formed Salt is an ionic compound formed from the other parts of the acid and base

Titration Titration is a lab technique used to determine the concentration of an acid or base Equivalence point is when the number of moles of H+ ions equals the number of moles of OH- ions in solution End point is when the indicator changes colors

Titration Curves Equivalence point is equal to 7 for strong acid + strong base.

Titration Curves Equivalence point is less than 7 for strong acid + weak base Equivalence point is greater than 7 for weak acid + strong base

Steps for Titration A measured volume of an analyte (usually acid) solution of unknown concentration is placed in an Erlenmeyer flask A few drops of indicator are added to the flask A measured volume of a titrant (usually base) of known concentration is placed in a buret and slowly added to the acid until the indicator changes color analyte= substance that is being identified or measured

Calculating Neutralization This is a 3-step process. Volumes must be converted to liters! Calculate the moles of titrant added to the Erlenmeyer flask (moles = M x V) Use mole ratios from the balanced equation to calculate the moles of analyte. Calculate the concentration of the analyte using the molarity equation.

Practice Titrant = HCl Analyte = NaOH Solutions of sodium hydroxide are used to unclog drains. A 43.0 mL volume of NaOH was titrated with 32.0 mL of 0.100 M HCl. What is the molarity of the sodium hydroxide solution? Mtitrant = moltitrant = Vtitrant = Manalyte = molanalyte = Vanalyte =

Practice Titrant = Analyte = A volume of 25.0 mL of 0.120 M HBr neutralizes 40.0 mL of a NaOH solution. What is the concentration of the NaOH solution? Mtitrant = moltitrant = Vtitrant = Manalyte = molanalyte = Vanalyte =

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Warm-up If 45.0 mL of 2.50 M NaOH is needed to neutralize 36.0 mL of a HCl solution, what is the molarity of the acid?