a hospital pharmacist dilutes 1 vial containing 1gm of antibiotic with10 ml of water. the sol. is then added to 100ml of D5W. what is the concentration in mg/ml of the antibiotic in the D5W?
2006-12-07 08:29:03 · 5 answers · asked by rimple 1 in Science & Mathematics ➔ Chemistry
No matter how much stuff the antibiotic is dissolved in there is only 1 g to start. After mixing the two solutions the total solution volume is 110 mL (I'm not sure what d5w is but I will assume that it is water with stuff in it). So the conc. is 1000mg in 110 mL or 1000/110 = 9.1 mg/mL.
2006-12-07 08:35:36 · answer #1 · answered by Picalo911 3 · 2⤊ 0⤋
initial dilution
? mg/ml = 1g/10ml = 0.1g/ml
You don't say if the D5W volume includes the 10ml added but I will assume it does. (otherwise the volume will be 110ml instead of 100ml)
2nd dilution
since all of the original mass is still present it is just like above with a different volume:
? mg/ml = [1g/100ml]x[(1000mg)/(1g) = 10 mg/ml
or 9.1mg/ml if there is a final volume of 110ml D5W
2006-12-07 08:40:35 · answer #2 · answered by rm 3 · 1⤊ 0⤋
9.09 mg/ml of antibiotic in aqueous D5W
2006-12-07 08:43:10 · answer #3 · answered by joyce m 1 · 0⤊ 0⤋
I agree with all the solutions given except the first.The last (9.9) is precise (though it would have been more helpful had he given the exact working out as the other two)but the other two are also almost correct.
2006-12-07 11:12:43 · answer #4 · answered by Prabhakar G 6 · 0⤊ 0⤋
s
2006-12-07 08:30:10 · answer #5 · answered by Miss Kitty 2 · 0⤊ 1⤋