A8 and A9. Numeracy

Question 1

concentration (M)=

Answer 1

amount (mol) / Volume (L)

Question 2

amount (mol)=

Answer 2

mass (g) / molecular weight

Question 3

C1 x V1=

Answer 3

C2 x V2

Question 4

equation for x IN y?

Answer 4

quantity x parts needed / total parts
ONE NOTE

Question 5

what does x TO y mean? use example diprobase cream 1 to 9

Answer 5

-1 to 9 means that for every 9 parts of something , you want one additional part to be the drug
-to work this out, convert to X in Y format
X to Y= X in (X + Y)
ONE NOTE

Question 6

How do you calculate X in Y?

Answer 6

quantity x parts needed / total parts + parts needed
ONE NOTE

Question 7

1g=

Answer 7

1ml

Question 8

how to calculate quantity of a drug in a medicine knowing the percentage?

Answer 8

quantity x percent required / 100

Question 9

what is a single strength, double strength and concentrated?

Answer 9

single strength- 1/40
double strength- 2/40
concentrated- 40/40
CALCULATION ON ONE NOTE

Question 10

what does the displacement value tell us?

Answer 10

tells us how much of the base gets displaced when the drug is added

Question 11

how do you calculate the amount of drug taken up by base?

Answer 11

mass of drug/ displacement value

Question 12

how do you calculate base needed?

Answer 12

total base - drug in base

Question 13

how do you calculate volume displaced?

Answer 13

volume displaced = mass of drug x displacement volume

Question 14

how do you calculate water required?

Answer 14

total water - volume displaced