Need help calculating percent composition

[babbagee]

Hello,

I need some help calculating the pecent composition of casien and lactose in milk. I started out with 50ml of nonfat milk, at the end of the experiment I got 1.599g casien and 1.610g of lactose. My idea was to convert these values into ml using density but I could not find the densities. Can someone lead me in the right direction.

 

[quetzalcoatl9]

Hello,

I need some help calculating the pecent composition of casien and lactose in milk. I started out with 50ml of nonfat milk, at the end of the experiment I got 1.599g casien and 1.610g of lactose. My idea was to convert these values into ml using density but I could not find the densities. Can someone lead me in the right direction.

if you are doing % composition by weight, then what is the weight of 50ml of milk? that would be all that you would need.

 

[babbagee]

Thats the problem, I just used 50ml of milk, i did not weigh it. The procedure I was following just said to use 50ml of milk, it did not say anything about weighing it.

 

[Borek]

You may give your results as % w/v - stupid and rather faulty units, but better then nothing.

 

[babbagee]

I actually figure it out. The procedure I was using did not give the density of milk, but one of my classmates had a different version of the procedure which gave the density. That was the only reason i was having this problem. I did not know the density. Thanks for your guys help