Pharmacy calculation Qs
Can anyone help me out on this calculation question?
A pharmacist has salicylic acid 2% ointment and salicylic acid 50% ointment in stock. He mixes 30g of each ointment together to make an ointment of a different strength. What is the strength (%w/v) of the resulting ointment?
A pharmacist has salicylic acid 2% ointment and salicylic acid 50% ointment in stock. He mixes 30g of each ointment together to make an ointment of a different strength. What is the strength (%w/v) of the resulting ointment?
It's a straight forward alligation method type question, what's the issue?
Original post by Mr Optimist
It's a straight forward alligation method type question, what's the issue?
Im asking for help, as in the answer and maybe how to get to the answer... no issue.. just a bit of help needed.
Original post by aladdin818
Im asking for help, as in the answer and maybe how to get to the answer... no issue.. just a bit of help needed.
Are you first year student? Just go look into the "alligation method". You'll pick it up quickly.
Another way you can do it is:
Find out how much active you have in 30g of the a) 2% and b)50% Then add them up to get "x". Then you know you have "x" grams in 60grams of total base. Now you need to convert it to %. I.e x/60 = y/100, solve for y and get the answer.
Find out how much active you have in 30g of the a) 2% and b)50% Then add them up to get "x". Then you know you have "x" grams in 60grams of total base. Now you need to convert it to %. I.e x/60 = y/100, solve for y and get the answer.
Original post by Mr Optimist
Another way you can do it is:
Find out how much active you have in 30g of the a) 2% and b)50% Then add them up to get "x". Then you know you have "x" grams in 60grams of total base. Now you need to convert it to %. I.e x/60 = y/100, solve for y and get the answer.
Find out how much active you have in 30g of the a) 2% and b)50% Then add them up to get "x". Then you know you have "x" grams in 60grams of total base. Now you need to convert it to %. I.e x/60 = y/100, solve for y and get the answer.
Thank you v much, I understand
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