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Converting ml to mg

Hello there

I wonder if anyone might be able to help me?

If I have 1 g per 100 ml of a protein solution, and I put 0.05 ml into a tube for an experiment, how much would this 0.05 be in mg (milligrams)?
Likewise, if I put 0.1 ml into a tube (separate tube) for an experiment, how much would this be in mg (milligrams)?

For these two questions, I have the answers 0.5 and 1 respectively, however I don't know how to work out these answers for myself.

If anyone could explain to me how to work out these questions I'd be hugely appreciative! Thank you. :smile:

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Original post by Ggdf
Hello there

I wonder if anyone might be able to help me?

If I have 1 g per 100 ml of a protein solution, and I put 0.05 ml into a tube for an experiment, how much would this 0.05 be in mg (milligrams)?
Likewise, if I put 0.1 ml into a tube (separate tube) for an experiment, how much would this be in mg (milligrams)?


1g = 100ml

therefore

0.01g = 1ml


So you can find the mass of, for example, 3ml by 3x0.01 = 0.03g
Original post by TenOfThem
1g = 100ml

therefore

0.01g = 1ml


So you can find the mass of, for example, 3ml by 3x0.01 = 0.03g


Surely you can't make that statement without knowing the density?
Original post by Chlorophile
Surely you can't make that statement without knowing the density?


Capacity will be proportional to volume
Reply 4
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Ggdf
OP
6
Original post by TenOfThem
1g = 100ml

therefore

0.01g = 1ml


So you can find the mass of, for example, 3ml by 3x0.01 = 0.03g


Thank you! I'm however still confused as to how the answers 0.5mg and 1mg came about?
Original post by Ggdf
Thank you! I'm however still confused as to how the answers 0.5mg and 1mg came about?


Ok, so you have 0.05ml

I have told you that 1ml = 0.01g

Therefore

0.05ml = 0.05x0.01g = 0.0005g

Do you know how to change g into mg?
Reply 6
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Ggdf
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Original post by TenOfThem
Ok, so you have 0.05ml

I have told you that 1ml = 0.01g

Therefore

0.05ml = 0.05x0.01g = 0.0005g

Do you know how to change g into mg?


Ah OK, I get it! So then I multiply by 1000 to go from g to mg?

Thank you very much! :smile:
Original post by Ggdf
Ah OK, I get it! So then I multiply by 1000 to go from g to mg?

Thank you very much! :smile:


yep

no problem

:smile:
Reply 8
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Ggdf
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Original post by TenOfThem
yep

no problem

:smile:


Thanks again :smile:. I was just wondering, if I then wanted to convert the 0.5, for example, to mg per ml, what would I need to do?
Original post by Ggdf
Thanks again :smile:. I was just wondering, if I then wanted to convert the 0.5, for example, to mg per ml, what would I need to do?


You know

1g = 100ml

1000mg = 100ml

10mg = 1 ml


So there are 10mg per ml
Reply 10
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Ggdf
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Original post by TenOfThem
You know

1g = 100ml

1000mg = 100ml

10mg = 1 ml


So there are 10mg per ml


That makes sense! But I'm still a bit confused as to what to do to express 0.5 mg in mg per ml.
I really appreciate your help!
Original post by Ggdf
That makes sense! But I'm still a bit confused as to what to do to express 0.5 mg in mg per ml.
I really appreciate your help!



Your question does not make sense I am afraid

mg per ml is a rate and will not change it is the mass (in mg) of 1ml

0.5mg is a mass, not a rate
Reply 12
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Ggdf
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Original post by TenOfThem
Your question does not make sense I am afraid

mg per ml is a rate and will not change it is the mass (in mg) of 1ml

0.5mg is a mass, not a rate


When I say mg per ml, I mean it as mg/ml. I'm meant to express 0.5mg as mg/ml when we know that there is 1g/100ml.
Original post by Ggdf
When I say mg per ml, I mean it as mg/ml. I'm meant to express 0.5mg as mg/ml when we know that there is 1g/100ml.


I know what you mean by mg per ml

BUT

0.5 mg is not mg per ml




Let me try to explain

Say you are driving at 60 mph

And you drive for 2 hours

You will have driven 120 miles



You are asking - how can I express 120 in miles per hour - well you can't
Original post by Ggdf
When I say mg per ml, I mean it as mg/ml. I'm meant to express 0.5mg as mg/ml when we know that there is 1g/100ml.


You have succeeded in making what was originally a very simple question into a complete minefield. Go back to the original question and look at the responses which helped you solve the problem very quickly. It all went haywire with your response at 20.07. General tip - don't look for difficulties when they're not there!
Reply 15
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Ggdf
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Original post by TenOfThem
I know what you mean by mg per ml

BUT

0.5 mg is not mg per ml




Let me try to explain

Say you are driving at 60 mph

And you drive for 2 hours

You will have driven 120 miles



You are asking - how can I express 120 in miles per hour - well you can't


I see what you're saying. It's probably why I'm confused! l can't imagine what they expect me to write in order to express the 0.5 in mg/ml.
Reply 16
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Ggdf
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Original post by unclefred
You have succeeded in making what was originally a very simple question into a complete minefield. Go back to the original question and look at the responses which helped you solve the problem very quickly. It all went haywire with your response at 20.07. General tip - don't look for difficulties when they're not there!


I hear you, but it's my exercise sheet that's asking, not me! I'm just desperate to understand what I'm expected to be doing.
Original post by Ggdf
I hear you, but it's my exercise sheet that's asking, not me! I'm just desperate to understand what I'm expected to be doing.


Can you type the question exactly

Or a screen shot
Reply 18
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Ggdf
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Original post by TenOfThem
Can you type the question exactly

Or a screen shot


Thank you for your help.

Protein question.jpg

I haven't filled in the table yet, but Solution X is 0.5 and solution Y is 1.
Original post by Ggdf
Thank you for your help.


I haven't filled in the table yet, but Solution X is 0.5 and solution Y is 1.


Ok

now can you show the rest of the information - this does not really relate to the questions you were asking in the OP

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