Titrations

Equipment

100

Placed under flask to improve solution visibility.

What is paper?

200

The thing used to hold the base solution.

What is a bottle?

300

The instrument used to hold the titrate dispenser.

What is a ring stand?

400

A piece of equipment used to drip/stream liquid into conical flask.

What is a Burette?

500

The piece used to accurately transfer a precise amount of liquid.

What is a volumetric pipette?

Henderson-Hasselbalch Problems

100

Calculate the pH of a solution that is 0.50 M acetic acid (CH₃COOH) and 0.50 M sodium acetate (CH₃COONa). Determine if acidic or alkali.

(The pK_a of acetic acid is 4.76)

4.76

Acidic

200

Calculate the pH of a buffer solution containing 0.15 M ammonia (NH₃) and 0.35 M ammonium chloride (NH₄Cl). Determine if acidic or basic.

(The pK_a for NH₄⁺ is 9.25)

8.88

Base

300

You need to create a pH 7.40 buffer using 0.10 M NaH₂PO₄ (acid) and Na₂HPO₄ (conjugate base). What concentration of Na₂PHO₄ is required?

(The pK_a of H₂PO₄^- is 7.21)

0.155 M

400

A 50.0 mL sample of 0.10 M formic acid (HCOOH, pK_a is 3.75) is titrated with 20.0 mL of 0.10 M NaOH. Calculate the pH of the resulting solution and determine if acidic or basic.

3.57

Base

500

You titrate 100.0 mL of 0.20 M Methylamine (CH₃NH₂, pK_a is 3.36) with 40.0 mL of 0.25 M HCL. Calculate the pH of the resulting solution and determine if acidic or alkali.

10.64

Alkali

Conceptual

100

How you measure how much of the solution put into the flask.

What is from the top-down?

200

The sign of a perfect titration and how long it lasts.

What is a faint pink color that lasts for 30 second?

300

When do you add the indicator to the solution.

What is before adding the base?

400

A plot of a analyte's pH against the volume of titrant added and used to visualize the progress of the reaction.

What is a titration curve?

500

Titrations are used to find this.

What is the concentration of an unknown?

Definitions

100

The number on the pH scaled that determines neutrality.

What is 7?

200

The solution with a known concentration

What is titrant?

300

Used to measure acidity, basicity, and neutrality of a substance.

What is the pH scale?

400

The definition that says acids are proton donors and bases are proton acceptors.

What is the Bronsted-Lowry Definition?

500

The definition that says acids release H⁺ ions in water, while bases release OH^- in water.

What is the Arrhenius Definition?

Wild!

100

One of Dr. Hagenhoff's favorite words.

What is Amphoteric?

200

The first thing you do with the titrant.

What is standardize it?

300

Which of these is a strong acid:

H₃PO₄, HCOOH, H₂SO₄, HS^-

What is sulfuric acid (H₂SO₄)?

400

The bond angle of a tetrahedral.

What is 109.5 degrees?

500

Dr. Hagenhoffs karaoke name.

What is