prenursing math help someone

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I have a problem to figure out for Chemistry and I cant get it for some reason. Can someone please help me solve this. The question is:

A pharmacy tec. is asked to prepare an IV solution that will contain 500 mg of cephalosporin for every 100 ml of normal saline solution. The total volume of saline will be 1 L. How many grams of cephalosporin will be needed for this iv solution?

I would appreciate any help on this. Thanks.

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Specializes in Infusion.

Well, how many times does 100 mls go into 1 liter (1000 mls)? I'd say about 10 times. Do you think you can solve it from here?

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I figured that part out but stuck on what to do next. I somehow end up with .5g/1000ml. My teacher didn't teach this to us yet and I'm just trying to figure it out on my own.

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Specializes in Infusion.

Almost. So, you know that you'll need 5000 mg of the cephalosporin. When you convert it to grams, just take the decimal point and go back 3 spaces. I had a teacher who would tell us 1000 has 3-zeros so depending on whether you divide or multiply by 1000, you'll move the decimal point forward 3 or back 3 spaces. I hope that helps.

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Thank you for your help. The answer is 5 grams right. I came up with that last night but honestly I dont know how. I think I'm confusing myself too much here. Can someone break down exactely how this is done?

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