What is a solution with a pH of less than 7 classified as?
Acid
What is the range of the pH scale?
0-14
What is the equation to calculate the hydronium ion concentration from the pH?
[H3O+] = 10-pH
What is the purpose of an indicator strip?
It identifies the pH number of a substance through a paper dye turning a different color.
What is a pH meter?
It is an electrochemical instrument that can measure pH accurately.
What happens when mixing bases and acids together?
They can cancel out or neutralize their effects
The darker colors are located on the right side of the scale, which is the _____ side. What is the blank?
"basic"
A solution has a pH of 2. What will the molarity (or concentration) of [H3O+] be?
0.01M or 10-2M
What are the usual indicator strips?
What is litmus paper and synthetic.
Are the pH meter and indicators measuring the same way? Explain how the results compare.
No - They use different procedures, but the outcome is the same.
What is a solution with a pH of greater than 7 classified as?
Base
A pH value of 6 is 10 times more acidic than a pH of ____. What is the blank?
7
What is the equation for calculating pH?
pH= -log[H3O+] or pH= -log[H+]
True or False: Thymol blue indicator remains blue when pH of a solution is 10 or higher. Explain why?
True, it is a base.
The probes in the machine creates an electrical voltage between two electrodes. True or false?
True
What is it called when acidity and basicity are balanced?
Neutral
Why is pure water natural?
It is neither acidic or basic in its natural state.
Since the log has a negative sign, what will happen to the concentration of hydronium ion if the pH decreases?
The hydronium ion concentration will increase, while the pH will decrease.
How are universal indicators are made?
By blending numerous indicators together to combine into a universal indicator which changes color throughout the pH range.
Where does the measurement of the pH reading show up?
On the meter's screen
What do the letters pH represent?
Power of Hydrogen
Two ways to measure the pH are with an ________ and a ________.
1. Indicator strip
2. pH meter
What is the pH of a solution that contains 15.0 grams of HCl dissolved in 7.0L of solution?
What is pH=1.2
How is the pH paper beneficial?
It matches the color the paper develops to a standard chart, so it is easier to measure the solution's pH.
Which is more precise: a pH meter or an indicator strip? Why?
The pH meter is more precise because it can measure the pH with up to 2 significant digits after the decimal.