15mg of atropine sulfate is needed to make 30ml of a 1:200 solution
To find the mass of atropine sulfate, first, the ratio should be converted into a percentage. The given ratio is 1:200
Percentage mass = (1/200) x 100
= 1/2%
Percentage mass = 0.5%
Let us consider the mass of atropine sulfate required to be x
Therefore,
0.5/100 ml = x / 30ml
x = (0.5/100)30
x = 0.15g
On converting 0.15g to milligrams we get,
x = 0.15 x 1000
x = 150mg
Therefore, the required mass of atropine sulfate to make 30 ml of a 1:200 solution is 150mg.
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