Titrations!.

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Presentation transcript:

Titrations!

Titrations Titration: adding a known amount of solution of known concentration to a solution with an unknown concentration Goal: To determine the unknown concentration of a solution

Titrations Endpoint: the point of neutralization in a titration How do we know we reached the endpoint in a titration? We use an indicator and look for a color change! http://www.youtube.com/watch?v=g8jdCWC10vQ

To solve this problem, we need to use the box method! Titration Example A 2.5 L solution of H2SO4 is completely neutralized by 0.5 L of 1.0 M NaOH. What is the concentration of the H2SO4 solution? In buret: 1.0 M NaOH To solve this problem, we need to use the box method! In Erlenmeyer flask: ? M H2SO4

A 2. 5 L solution of H2SO4 is completely neutralized by 0. 5 L of 1 A 2.5 L solution of H2SO4 is completely neutralized by 0.5 L of 1.0 M NaOH. What is the concentration of the H2SO4 solution? H2SO4 + 2 NaOH  Na2SO4 + 2 H2O Step 1: Write the balanced neutralization equation.

A 2. 5 L solution of H2SO4 is completely neutralized by 0. 5 L of 1 A 2.5 L solution of H2SO4 is completely neutralized by 0.5 L of 1.0 M NaOH. What is the concentration of the H2SO4 solution? Moles (mol) Molarity (M) Liters (L) 1.0 M 2.5 L 0.5 L H2SO4 + 2 NaOH  Na2SO4 + 2 H2O Step 2: Construct the box and fill in known information.

H2SO4 + 2 NaOH  Na2SO4 + 2 H2O * 1.0 M 2.5 L 0.5 L 0.25 mol 0.5 mol A 2.5 L solution of H2SO4 is completely neutralized by 0.5 L of 1.0 M NaOH. What is the concentration of the H2SO4 solution? x 1/2 Multiply by molar ratio Moles (mol) Molarity (M) * 1.0 M Liters (L) 2.5 L 0.5 L 0.25 mol 0.5 mol 0.10 M Moving up = multiply Moving down = divide H2SO4 + 2 NaOH  Na2SO4 + 2 H2O Step 3: Calculate missing information until you determine what the problem is asking you to find.

Titration Practice - #1 on WS 30 mL of 0.10 M NaOH is used to completely neutralize 25.0 mL of HCl. Determine the concentration of the acid. Moles (mol) Molarity (M) Liters (L)

HCl Titration Lab – Analysis Questions From your blue self-assessment sheet…

Titration Practice #1 A 1.5 L solution of HCl is completely neutralized by 2.0 L of 0.5 M Al(OH)3. What is the concentration of the HCl solution? Moles (mol) Molarity (M) Liters (L)

Titration Practice #2 A 25 mL solution of H2SO4 is completely neutralized by 6.5 mL of 1.0 M NaOH. What is the concentration of the H2SO4 solution? Moles (mol) Molarity (M) Liters (L)