Dilution and Concentration Calculations

This video tutorial covers various methods of dilution and concentration calculations, including examples from pharmaceutical calculations. It explains how to double the strength of a cough syrup, calculate the percentage strength of a diluted solution, determine ratio strength, and prepare solutions from stronger concentrations. The video also provides tips on converting gallons to milliliters and making estimations.

What is the primary method used for solving dilution and concentration problems in this video?

• Trial and error method

• Graphical analysis

• Special pharmaceutical formulas

• Dimensional analysis and c1v1=c2v2 formula

If a pharmacist wants to double the strength of a cough syrup without increasing its volume, how many milligrams of the active ingredient should be added to a 60 ml container?

• 6 mg

• 12 mg

• 24 mg

• 30 mg

What is the percentage strength of a solution after diluting 500 ml of a 15% solution to 1500 ml?

• 10%

• 7.5%

• 5%

• 3.5%

When 50 ml of a 1:20 weight by volume solution is diluted to 1000 ml, what is the resulting ratio strength?

• 1:200

• 1:800

• 1:400

• 1:500

If a syrup containing 65% sucrose is evaporated to 85% of its volume, what will be the new percentage of sucrose?

• 70%

• 76%

• 85%

• 80%

How many grams of a 10% ammonia solution can be made from 1800 grams of a 28% ammonia solution?

• 4000 grams

• 4500 grams

• 5040 grams

• 3500 grams

What is the volume in milliliters of a 30% solution evaporated to a 50% solution if the initial volume is one gallon?

• 2500 ml

• 2271 ml

• 3500 ml

• 3000 ml

What is the equivalent of one gallon in milliliters?

• 3785 ml

• 4000 ml

• 3500 ml

• 3600 ml

If you convert one gallon using fluid ounces, what is the approximate milliliter value you should expect?

• 3840 ml

• 3785 ml

• 4000 ml

• 3600 ml

What should you do if you get a higher value when converting units in an exam?

• Ignore the conversion

• Choose the closest lower value

• Choose the highest value

• Recalculate until you get the exact value