DISSOLUTION FORMULAS

Question 1

FORMULAS | AMOXICILLIN

A, 1st step

Answer 1

Cstd = wt of standard / volume of sample x dilution factor
100mg / 100mL x 1mL/100mL

CONCENTRATION STANDARD, constant 0.01mg/ml

Question 2

FORMULAS | AMOXICILLIN

B, 2nd step

Answer 2

Csx = Au/As x Cstd

CONCENTRATION OF CAP/TAB = mg/mL

Question 3

FORMULAS | AMOXICILLIN

C, 3rd step

Answer 3

Csample = wt of sample / volume x DF
DF = 0.9 / 50mL

CONCENTRATION OF SAMPLE = mg/mL

Question 4

FORMULAS | AMOXICILLIN

aliquot

Answer 4

V x aliquot portion / wt of sample

Question 5

FORMULAS | AMOXICILLIN

D, 4th step

Answer 5

amt per tab/cap = conc. UNKNOWN / conc. SAMPLE x ave weight

Question 6

FORMULAS | AMOXICILLIN

E, 5th step

Answer 6

%labelled claim = amt per tab/cap / labelled claim x 100

Question 7

FORMULAS | AMOXICILLIN

SEQUENCE

Answer 7

1. Conc. standard = Cstd
2. Conc. of cap/tab = Csx
3. Conc. of sample = Csample
4. Amt per tab/cap
5. %labelled claim