Solubility - Common Measuring Units

solution solute water sugar

Solubility is often expressed in grams of solute per 0.2 lb (100 g) of solvent, usually water. At 122°F (50°C), the solubility of sugar in water is approximately 130 g/sugar in 100 g water. If you were to add 0.26 lb Figure 1. Solubility curve for various solutes in water. Illustration by Hans & Cassidy. Courtesy of Gale Group. (130 g) of sugar to 0.2 lb (100 g) of water at 122°F (50°C), the resulting solution would be saturated. Adding 0.26 lb (131 g) would mean that even with continuous stirring, 0.002 lb (1 g) of sugar would remain at the bottom of your container.

Sometimes, solubility is expressed as grams of solute per 0.2 lb (100 g) of solution. In this case the value of the solubility of sugar in 0.2 lb (100 g) of solution at 122°F (50°C) would be less than 0.26 lb (130 g), because unlike the previous example where the weight of the solvent was fixed, the weight of a solution changes as solute is added.

Other commonly used units include g/L (grams of solute per liter of solution) and m/L (moles of solute per liter of solution). Solubility units always express the maximum amount of solute that will dissolve in either a given amount of solvent, or a given amount of solution, at a specific temperature.

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User Comments

about 4 years ago

YAY! Thank you very much! I forgot the units of solubility and this really helped me. Thanks again..

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over 2 years ago

yes

hey i want to use the "handbook of pharmaceutical excipients", to find the solubility. i found these discription for the solubility.

"Section 10, Typical Properties, describes the physical properties

of the excipient which are not shown in Section 9. All

data are for measurements made at 20 degree C unless otherwise

indicated. Where the solubility of the excipient is described in

words, the following terms describe the solubility ranges:

Very soluble 1 part in less than 1

Freely soluble 1 part in 1–10

Soluble 1 part in 10–30"

My question is, how can i convert this to mg/ml (normal units, everyone understands?

almost 4 years ago

Celcius (°C) to Fahrenheit (°F) conversion mentioned in your article can be made here -> http://www.easyunitconverter.com/heat-and-temperature-conversion/heat-and-temperature-unit-converter.aspx

Pound (lb) to gram or kilogram can be made here -> http://www.easyunitconverter.com/weight-unit-conversion/weight-unit-converter.aspx

Hope it helps to other readers...

Keep up the good work!

over 4 years ago

ps sorry 4 got to metion before that the information this person has provided is incorrect. laura

over 4 years ago

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over 4 years ago

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over 4 years ago

thanks a lot this was really helpful i found this info after a long time

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Laura

2 months ago

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3 months ago

for my daughter assignment i want how sugar is soluble in hot water, ice cold water & normal tap water pls explain