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Dilution and Concentration


Percentage Strength determination on Dilution/Concentration
Ratio Strength on Dilution/Concentration
Stock Solutions
- Method (i)
- Method (ii)
- Method (iii)
- Diluent Calculation
Alcohol Dilution
Acid Dilution
Dilution and Concentration of Solids
- Method (i)
- Method (ii)
- Method (iii)
- Method (iv)
- Method (v)
Alligation medial - Percentage strength of mixture
Alligation Alternate
Specific gravity of Mixture










Percentage Strength determination on Dilution/Concentration

InitialFinal
Volume (mL):
Strength (%):
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If a liquid containing % (w/v) of a chemical substance is evaporated to % of its initial volume, then the percentage of the chemical substance in the final volume is

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Ratio Strength determination on Dilution/Concentration

InitialFinal
Volume (mL):
Ratio 1:
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Stock Solutions - Method (i)

Concentration of Stock Solution:% (or)1:
Concentration of Final Solution:% (or)1:
Volume of Final Solution:
Volume of Stock Solution required:
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Stock Solutions - Method (ii)

If ml of stock solution has to be prepared such that ml of it when diluted to ml will yield a ratio strength of 1: (or) %, then the amount of the substance required to prepare the stock solution is --- grams.

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Stock Solutions - Method (iii)

If % (w/v) concentrate of a substance should be used in preparing ml of stock solution, such that ml diluted to ml will yield a 1: (or) % strength solution, then the quantity of the initial stock solution is --- ml.

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Stock Solutions - Diluent Calculation

If a solution with strength of % (or) 1: has to be prepared by using ml of a 1: (or) % strength solution, then the quantity of the diluent required is --- ml.

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Alcohol dilution

If ml of % (v/v) alcohol is used to make % (v/v) alcohol then, the quanitity of water to be mixed is .

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Acid Dilution

To make ml of % (w/v) acid with % (w/v) acid of specific gravity , the quantity of acid and water required are ---- ml and ---- ml.

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Dilution and Concentration of Solids - Method (i)

To prepare grams of a substance containing % (w/w) of an active ingredient from % (w/w) of that substance, the quantity of the substance and diluent required are --- grams and --- grams respectively.

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Dilution and Concentration of Solids - Method (ii)

If a moist crude drug contains % of water and % (w/w) of active ingredient then, the percentage (w/w) of active ingredient after drying the crude drug will be %

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Dilution and Concentration of Solids - Method (iii)

To prepare grams of % ointment from the same oitment of % strength then the quantity of ointment and ointment base required are --- grams and --- grams respectively.

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Dilution and Concentration of Solids - Method (iv)

How many grams of an active ingredient should be added to grams of a % ointment to increase its concentration to % without change in the total quantity of the ointment?

Result: --- grams
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Dilution and Concentration of Solids - Method (v)

To prepare % hydrous lanolin from grams of anhydrous lanolin, the quantity of the water to be added is --- grams or mL.

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Alligation medial - Percentage Strength of mixture

No.Percentage strengthQuantity
1
2
3
4
5
6

Result--

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Alligation Alternate

Desired percentage strength:
Required Total Quantity:

Available strengthsProportions

1.
2.
3.
4.
5.

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Specific gravity of Mixture

No.Specific GravityQuantity*
1
2
3
4
5
6

Result--

* - in a common denomination of volume
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