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Avelino Activity3

This document provides instructions and examples for measuring common pharmaceutical ingredients using various instruments. It discusses drawing pictures of common volume and weight measurement tools like beakers, pipettes, burettes, graduated cylinders, volumetric flasks, electronic balances, weighing scales, and double-pan torsion balances. It also provides examples of how to use these tools to obtain specific quantities of several substances within acceptable error limits, such as weighing 50mg of chlorpheniramine maleate within 5% error using a prescription balance.

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Debbie S. Avelino
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129 views4 pages

Avelino Activity3

This document provides instructions and examples for measuring common pharmaceutical ingredients using various instruments. It discusses drawing pictures of common volume and weight measurement tools like beakers, pipettes, burettes, graduated cylinders, volumetric flasks, electronic balances, weighing scales, and double-pan torsion balances. It also provides examples of how to use these tools to obtain specific quantities of several substances within acceptable error limits, such as weighing 50mg of chlorpheniramine maleate within 5% error using a prescription balance.

Uploaded by

Debbie S. Avelino
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as DOCX, PDF, TXT or read online on Scribd
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NAME:

BS PHARMACY 1B

ACTIVITY 3
CHAPTER 3

PLEASE HIGHLIGHT IN YELLOW OR BOX IN YOUR FINAL ANSWER.


PLEASE SHOW YOUR SOLUTIONS WHEN NEEDED (handwritten). PLEASE WRITE LEGIBLY AND
SCAN CLEARLY.

1. Draw/ Show Pictures of Common instruments for pharmaceutical measurement of volume

Beaker Bulb and graduated pipette

Burette

Graduated cylinder Volumetric Flasks and Cylinders


2. Draw/ Show Pictures of Common instruments for pharmaceutical measurement of weight

Electronic balance Weighing Scale

Double-pan Torsion Balance

3. A prescription calls for 50 mg of chlorpheniramine maleate. Using a prescription balance with a


sensitivity requirement of 6 mg, explain how you would obtain the required amount of
chlorpheniramine maleate with an error not greater than 5%

MF = 3

X= 50mg
4. A torsion prescription balance has a sensitivity requirement of 4mg. Explain how you would
weigh 5 mg of hydromorphone hydrochloride with an error not greater than 5%. Use lactose as
the diluent.

a. MF = 20

b. MF = 16

Tip: solve for the SQM

A => x= 5mg

B => x= 5mg

5. Using a balance with a sensitivity of 4mg, an acceptable weighing error of 5% and cherry syrup
as the solvent for tartar emetic, how would you obtain the correct quantity of tartar emetic to
fill the prescription?

Rx Sodium citrate 5g

Tartar emetic 0.015 g

Cherry Syrup 120 mL qs ad

MF = 6

Solve for SQM


Solve for MQ of tartar emetic
Mixture is 115 mL (Cherry Syrup ad)
Proceed to Aliquot weight
X= 0.063 g

6. Using a 10mL graduate calibrated in 2 mL units, explain how you would measure 0.5 mL of a dye
solution by the aliquot method. Use water as the diluent.

MF = 4

X= 0.5mL
7. A pharmacist attempts to weigh 120mg of codeine sulphate on a balance with a sensitivity
requirement of 6mg. calculate the maximum potential error in terms of percentage.

Percentage error = 5%

8. In compounding a prescription, a pharmacist weighed 0.05g of a substance on a balance


insensitive to quantities smaller than 0004 g. what was the maximum potential error in terms of
percentage?

Percentage Error = 8%

9. A pharmacist weighed 475mg of a substance on a balance of dubious accuracy. When checked


on a balance of high accuracy, the weight was found to be 445mg. calculate the percentage
error in the first weighing.

Percentage Error = 106.7%

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