Why is it beneficial to use a logarithmic scale to measure pH?

Why is it beneficial to use a logarithmic scale to measure pH?

A - It is easy to calculate
B - A wider range of values can be measured
C - It is not beneficial
D - It is easy to remember


Answer: B - A wider range of values can be measured

When measuring acidity you are measuring very small values (concentrations are normally less than 1). It allows you to have more concrete measurements and associates acidity with an actual number.

Which of the following is a strong acid?

Which of the following is a strong acid?

A - CH3COO-
B - CH3COOH
C - OH-
D - HCl


Answer: D - HCl

An ACID is any sort of molecule which will donate a hydrogen ion to the solution. A STRONG acid is an acid which will dissociate completely to form an anion and a hydrogen ion.

The pH scale is a way of measuring _______.

The pH scale is a way of measuring _______.

A - Concentration
B - Acidity
C - Volume
D - Time


Answer: B - Acidity

It is measuring the concentration of hydrogen ions. Solutions with a pH of 7 are considered neutral, a pH lower than 7 is considered acidic, and a pH greater than 7 is considered basic.

The pH scale is a _______ scale.

The pH scale is a _______ scale.

A - Weight
B - Pound
C - Newton
D - Logarithmic


Answer: D - Logarithmic

A logarithmic scale is used so that a wider range of values can be measured.

Which of the following is a strong base?

Which of the following is a strong base?

A - NaOH
B - NaCl
C - NaHCO3
D - H+


Answer: A - NaOH

A BASE is any type of molecule which can accept hydrogen bonds from a solution. A STRONG base dissociates completely to form a cation and a hydroxide ion.

Which of the following is an example of diffusion?

Which of the following is an example of diffusion?

A - Salt dissolving in water without stirring
B - Cells exploding in a hypo-tonic solution
C - Precipitation of a solid from a solution
D - Water moving across a semi-permeable membrane


Answer: A - Salt dissolving in water without stirring.
DIFFUSION is the passive movement of substance from areas of higher concentration to areas of low concentration.