WorksheetsAcids and Bases Quiz
Total questions: 15
Worksheet time: 11mins
So what is the definition of a base?
Bases accept protons
Bases are proton donors
Bases increase the number of protons in an aqueous solution
Bases donate protons to water molecules
Egg white has a proton concentration of approximately 0.00000001 M (10-8). or 1 times 10 to the power of negative 8 moles per liter How would you categorize egg white?
Slightly basic
Neutral
Slightly acidic
Strongly acidic
What was transferred from the hydrochloric acid to the water molecule? Click on the background to slide down the LabPad and have a look again.
An electron
A hydrogen atom
H+ a proton
A water molecule
How are the pOH and pH linked? Lower your LabPad to take a look at the graph and figure out the numbers.
pH + pOH = 14
pH = 7 + pOH
7 * pH = 14 - pOH 7 times pH equals 14 minus pOH
7 + pOH = pH - 7PH Minus 7
Guess how many water molecules self-ionize in one liter of water!
2 moles
0.0000001 moles or one to the power of minus seven
10,000,000 moles
1 mole
Remember the Bronsted-Lowry definition of acids and bases? What is water according to this definition?
An acid and a base
An acid
A base
Neither acid nor base
Based on what you have seen, which is the best definition for an acid?
Acids split into two molecules in aqueous solution
Acids accept protons from water molecules
Acids remove a proton from each water molecule
Acids donate protons in aqueous solution
Which unit is used to express the acidity of an acid or alkaline solution?
pH
Moles
Voltage
Karat
What results from a reaction of a base (NaOH) Sodium hydroxide and a hydronium ion (H3O+)H three O plus?
2 H2O and Na+
2 water molecules and sodium cation
Water and a strong base
Water and a strong acid
What makes an acid acidic?
Chemical structure
Temperature
Phase
Number of protons in a molecule
If you have a glass of pure water, without any acids or bases, how many hydronium ions (H3O+) do you expect?
The same number as OH- hydroxide anions
None
Half the water is hydronium ions
As many as there are water molecules
What's the difference in concentration of hydronium ions between pH 1 and pH 4?
x 1000a thousand times
x 10ten times
x 4four times
x 2.6two point six times
What is the smallest pH possible?
There is no fixed minimum
0
1
14
Click the background to slide down the LabPad and take a look at the graph. Does the intake of acidic or alkaline foods affect the blood pH?
No, the blood pH is constant
Yes, the pH increases after eating
No, the blood pH fluctuates randomly
Yes, acidic food decreases pH and alkaline food increases it
What precautions should you take when working with strong acids and bases? (select the ones you considere)
Always wear goggles and gloves
Only use plastic lab equipment
Only perform work in the fume hood
Keep a Bunsen burner switched on nearby
