 ## Dilution and Concentration

Percentage Strength determination on Dilution/Concentration
Ratio Strength on Dilution/Concentration
Stock Solutions
Alcohol Dilution
Acid Dilution
Dilution and Concentration of Solids
Alligation medial - Percentage strength of mixture
Alligation Alternate
Specific gravity of Mixture

### Percentage Strength determination on Dilution/Concentration

 Initial Final Volume (mL): Strength (%): Top

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

### Ratio Strength determination on Dilution/Concentration

 Initial Final Volume (mL): Ratio 1: Top

### 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: Top

### 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.

### 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.

### 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.

### Alcohol dilution

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

### 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.

### 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.

### 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 %

### 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.

### 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

### 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.

### Alligation medial - Percentage Strength of mixture

No.Percentage strengthQuantity
1
2
3
4
5
6

Result--

Top

### Alligation Alternate

 Desired percentage strength: Required Total Quantity:
 Available strengths Proportions 1. 2. 3. 4. 5.

### Specific gravity of Mixture

No.Specific GravityQuantity*
1
2
3
4
5
6

Result--

* - in a common denomination of volume
Top