What are the different ways of expressing concentrations of solutions?

Answer 1

There are a number of ways to express the relative amounts of solute and solvent in a solution. This page describes calculations for four different units used to express concentration:

• Percent Composition (by mass)
• Molarity
• Molality
• Mole Fraction

Percent Composition (by mass)

We can consider percent by mass (or weight percent, as it is sometimes called) in two ways:

• The parts of solute per 100 parts of solution.
• The fraction of a solute in a solution multiplied by 100.

We need two pieces of information to calculate the percent by mass of a solute in a solution:

• The mass of the solute in the solution.
• The mass of the solution.

Use the following equation to calculate percent by mass:

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Molarity

Molarity tells us the number of moles of solute in exactly one liter of a solution. (Note that molarity is spelled with an "r" and is represented by a capital M.)

We need two pieces of information to calculate the molarity of a solute in a solution:

• The moles of solute present in the solution.
• The volume of solution (in liters) containing the solute.

To calculate molarity we use the equation:

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Molality

Molality, m, tells us the number of moles of solute dissolved in exactly one kilogram of solvent. (Note that molality is spelled with two "l"'s and represented by a lower case m.)

We need two pieces of information to calculate the molality of a solute in a solution:

• The moles of solute present in the solution.
• The mass of solvent (in kilograms) in the solution.

To calculate molality we use the equation:

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Mole Fraction

The mole fraction, X, of a component in a solution is the ratio of the number of moles of that component to the total number of moles of all components in the solution.

To calculate mole fraction, we need to know:

• The number of moles of each component present in the solution.

The mole fraction of A, XA, in a solution consisting of A, B, C, ... is calculated using the equation:

To calculate the mole fraction of B, XB, use:

by the amazing PITOGO HIGH SCHOOL of Makati City

III-JADE

Answer 2

There are a number of ways to express the relative amounts of solute and solvent in a solution. This page describes calculations for four different units used to express concentration:

• Percent Composition (by mass)
• Molarity
• Molality
• Mole Fraction

Percent Composition (by mass)

We can consider percent by mass (or weight percent, as it is sometimes called) in two ways:

• The parts of solute per 100 parts of solution.
• The fraction of a solute in a solution multiplied by 100.

We need two pieces of information to calculate the percent by mass of a solute in a solution:

• The mass of the solute in the solution.
• The mass of the solution.

Use the following equation to calculate percent by mass:

Molarity

Molarity tells us the number of moles of solute in exactly one liter of a solution. (Note that molarity is spelled with an "r" and is represented by a capital M.)

We need two pieces of information to calculate the molarity of a solute in a solution:

• The moles of solute present in the solution.
• The volume of solution (in liters) containing the solute.

To calculate molarity we use the equation:

Molality

Molality, m, tells us the number of moles of solute dissolved in exactly one kilogram of solvent. (Note that molality is spelled with two "l"'s and represented by a lower case m.)

We need two pieces of information to calculate the molality of a solute in a solution:

• The moles of solute present in the solution.
• The mass of solvent (in kilograms) in the solution.

To calculate molality we use the equation:

Mole Fraction

The mole fraction, X, of a component in a solution is the ratio of the number of moles of that component to the total number of moles of all components in the solution.

To calculate mole fraction, we need to know:

• The number of moles of each component present in the solution.

The mole fraction of A, XA, in a solution consisting of A, B, C, ... is calculated using the equation:

To calculate the mole fraction of B, XB, use:

by the amazing PITOGO HIGH SCHOOL of MAKATI CITY

III-JADE

Answer 3

The concentration of solution means to express the amount of solute in specific amount of solvent or solution, there are different ways to represent the concentration of a solution as,

1-Molarity.. moles/dm3

2-Molality.. moles /K.g

3-Normality .. gram equivalent/dm3

4-Mole fraction

5-ppm

6-ppb.

Answer 4

im not so sure but from what we've just studied this is the list:

1.percent by mass Pm

2.percent by volume Pv

3.percentage mass-volume Pm/v

4.mole fraction Nf

5.molarity

6.molality

Answer 5

Concentration is usually expressed in moles per liter, which is called molarity. You could also use moles per mL and other measures of volume. It is also possible to convert this to any measurement of mass/volume (such as grams per liter, milligrams per liter, etc)

Molarity. which is Moles/Liter. molarity is expressed as captial m. (M)

so if you have 15 M HCl(aq) it is MUCH more concentrated than 5 M HCl(aq)

Answer 6

1.percent concentration
a.percent by mass
b.percent by volume
c.percent by mass-volume
2.molarity
3.molality
4.mole fraction
5.normality

Answer 7

In chemistry we might use moles per litre. In physics we'd be more likely to use g per litre or g per centimetre cubed.

Answer 8

Molarity (M) which is moles/liter of solution, molality (m) which is moles/kg solvent and grams/ml are 3 common ways to express concentration.

Answer 9

- molar concentration (official in SI)
- molal concentration (obsolete)
- concentration in grams/litre
etc.