Compounding Calculations

​Compounding Calculations

PHCO1301 Dr Mehta ​

Multiple Choice

What is the minimum weight you can weigh on a top pan balance?

• 1 g

• 0.5g

• 250 mg

• 5 g

​What is minimum weight that can be weighed on a top pan balance?

​500 mg

0.5 g​

Multiple Choice

What is 0.25 mL/mL as a percentage?

• 0.25% w/v

• 2.5 % v/v

• 25% v/v

• 25% w/v

​What is 0.25 mL/mL as a percentage?

0.25 mL/mL

​

​What is 0.25 mL/mL as a percentage?

0.25 mL/mL

0.25 mL per 1 mL

​

​What is 0.25 mL/mL as a percentage?

0.25 mL/mL

0.25 mL per 1 mL

25 mL per 100 mL

​

​What is 0.25 mL/mL as a percentage?

0.25 mL/mL

0.25 mL per 1 mL

25 mL per 100 mL

25% v/v​

Multiple Choice

What weight of iodine (express in milligrams) is required to make 50 mL of a 1% w/v solution?

• 0.5mg

• 50mg

• 500mg

• 0.5g

​What weight of iodine (express in milligrams) is required to make 50 mL of a 1% w/v solution?

​1% w/v

​

​What weight of iodine (express in milligrams) is required to make 50 mL of a 1% w/v solution?

​1% w/v

1g of iodine in 100 mL solution​

​

​What weight of iodine (express in milligrams) is required to make 50 mL of a 1% w/v solution?

​1% w/v

1g of iodine in 100 mL solution​

0.1g of iodine in 10 mL

​

​What weight of iodine (express in milligrams) is required to make 50 mL of a 1% w/v solution?

​1% w/v

1g of iodine in 100 mL solution​

0.1g of iodine in 10 mL

0.5g of iodine in 50 mL​

​

​What weight of iodine (express in milligrams) is required to make 50 mL of a 1% w/v solution?

​1% w/v

1g of iodine in 100 mL solution​

0.1g of iodine in 10 mL

0.5g of iodine in 50 mL​

500mg of iodine in 50 mL​

​What weight of iodine (express in milligrams) is required to make 50 mL of a 1% w/v solution?

​What weight of iodine (express in milligrams) is required to make 50 mL of a 1% w/v solution?

Multiple Choice

What does "recently prepared" mean when describing the expiry dates of products?

• 2 days

• 1 year

• 24 hours

• 4 weeks

​Expiry Dates

​Unless the formula specifically states otherwise, in the practical labs, we use an arbitrary data one year from manufacture

​

​Recently Prepared: 4 weeks from manufacture

​

Freshly Prepared: 24 hours from manufacture

​

​

Open Ended

You are expected to prepare 20 mL solution that contains 0.06 g of Sodium Carbonate. Explain how you would prepare this by making a stock solution containing 500 mg of Sodium Carbonate. Your answer must include a formula showing how a stock solution is made up.

​You are expected to prepare 20 mL solution that contains 0.06 g of Sodium Carbonate. Explain how you would prepare this by making a stock solution containing 500 mg of Sodium Carbonate. Your answer must include a formula showing how a stock solution is made up.

​Sodium Carbonate 500mg

Purified Water upto 10 mL ​

​

0.06 g = 60 mg

​

500 mg/10 mL

50mg / mL ​

5 mg / 0.1 mL​

Therefore 1.2 mL of stock solution that contains 60 mg Sodium Carbonate was used. ​

Multiple Choice

Is the following statement true or false?

"To prepare a 10% w/v iodine solution, 10 mg of iodine was dissolved in 95 mL of water. "

• True

• False

Fill in the Blank

"To prepare a 10% w/v iodine solution, 10 mg of iodine was dissolved in _____ of solution product. "

(include units!)

Poll

How are we feeling about calculations??