CHM Chapter 14
Terms in this set (21)
Which acid is part of the white coating on Sour Patch Kids?
What are the properties of acids?
- sour taste
- ability to dissolve many metals
- turn litmus paper blue
Choose some examples of foods that contain acids
What is the main component of stomach acid?
Why do we have stomach acid?
- Acid breaks down food
- Acid kills harmful bacteria
What are the properties of bases?
- turns litmus paper red
- slippery feel
- bitter taste
Provide some examples of common substances that contain bases
- baking soda
- drain clog removers
Which of the following acids contain a carboxylic acid group?
What are organic acids?
Organic acids contain the carboxylic acid group of atoms.
Choose two examples of organic acids.
- acetic and citric acid
Which of the following bases is the main ingredient in the product that unclogs drains, called "Drano"?
Give the Arrhenius definition of an acid.
An Arrhenius acid produces H+ in aqueous solution.
Which of the following is the definition of an Arrhenius base?
An Arrhenius base produces OH− ions in aqueous solutions.
Which of the following is the definition of a Brønsted-Lowry base?
A Brønsted-Lowry base is a proton acceptor.
According to the Brønsted−Lowry definition of acids and bases, what is a conjugate acid-base pair? According to the definition of acids and bases, what is a conjugate acid-base pair?
A conjugate acid-base pair is when two substances differ only by a single proton
What is a titration?
A titration is a laboratory procedure that is used to determine the unknown concentration of the solution.
What is the equivalence point?
The equivalence point is experimental point when the concentration of H+ is equal to the concentration of OH−.
You are given a solution of HCOOH (formic acid) with an approximate concentration of 0.20 M and you will titrate this with a 0.1105 M NaOH. If you add 20.00 mL of HCOOH to the beaker before titrating, approximately what volume of NaOH will be required to reach the end point?
20.00 mL HCOOH) x (0.20 M) x (1 mol NaOH / 1 mol HCOOH) / (0.1105 M NaOH) = 36.2 mL
You are given a solution of HCOOH (formic acid) with an approximate concentration of 0.20 M and you will titrate this with a 0.1105 M NaOH. You add 20.00 mL of HCOOH to the beaker before titrating, and it requires 35.43 mL of NaOH to reach the end point. What is the concentration of the HCOOH solution?
1. 0.1105 × (35.43/1000) = 0.003915 mol
2. Molarity of HCOOH = 0.003915 / (20.00/1000) = 0.1958 M
The titration of a 20.0-mL sample of an H2SO4 solution of unknown concentration requires 22.87 mL of a 0.158 M KOH solution to reach the equivalence point. What is the concentration of the unknown H2SO4 solution?
0.02287 * 0.518 = 0.01184666 moles of [OH-] = moles of [H+]
moles of [H+]/2 = moles of H2SO4
moles of H2SO4/0.02 = 0.296 M
A 15.00-mL sample of a NaOH solution of unknown concentration requires 17.88 mL of a 0.1053 M H2SO4 solution to reach the equivalence point in a titration. What is the concentration of the NaOH solution?
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