Concentrations
Posted: Tue May 20, 2008 8:55 pm
Some folks have e-mailed me to find out how to make a 2% solution so here’s an attempt to explain it it’s not exactly rocket science but it takes a little bit of math..
Ok for our example we will assume you want to make a 2% sugar solution, (substitute the sugar for anything you want.)
We start out with our bag of sugar and we want to use some of this dissolved into a quantity of water to make a 2% sugar solution after it’s dissolved.
Fortunately for us 1ml or cc of pure water weighs in at 1 gm, so 100 ml is 100 gm 1000 ml or 1 litre 1000gm or a kilo this makes the task at hand real easy
100 ml of water weighs in at 100 gm so to make To make “approx”100 ml of 2% solution
1% of 100 =1, 2% of 100 = 2, therefore we need 2 parts of sugar to 98 parts of water to make the whole at 2%
To if we weigh out 2 gm of sugar and add that to 98 cc or 98 gm of water, hey presto we have our 2% solution.
To expand this if you need approx 1 litre of 2% solution we need to add 20 gm sugar to 980 cc of water if you need multiply this up for higher volumes needed
If you need to make a higher percentage solution i.e 5 % solution it 5gm added 95 grams for approx 100 cc or 50 gm to 950 cc to make approx 1 litre 5%
Note: for most purposes its close enough to add the required amount of sugar to the full volume I.E. 2 gm added to 100 cc the difference is so miniscule 1.9607843%
dont forget usually we are not dealing with pure water tap water is not pure but its close enough, of course if you have RO you can get right down into the accuracy but generally its not needed
hope this helps
Ok for our example we will assume you want to make a 2% sugar solution, (substitute the sugar for anything you want.)
We start out with our bag of sugar and we want to use some of this dissolved into a quantity of water to make a 2% sugar solution after it’s dissolved.
Fortunately for us 1ml or cc of pure water weighs in at 1 gm, so 100 ml is 100 gm 1000 ml or 1 litre 1000gm or a kilo this makes the task at hand real easy
100 ml of water weighs in at 100 gm so to make To make “approx”100 ml of 2% solution
1% of 100 =1, 2% of 100 = 2, therefore we need 2 parts of sugar to 98 parts of water to make the whole at 2%
To if we weigh out 2 gm of sugar and add that to 98 cc or 98 gm of water, hey presto we have our 2% solution.
To expand this if you need approx 1 litre of 2% solution we need to add 20 gm sugar to 980 cc of water if you need multiply this up for higher volumes needed
If you need to make a higher percentage solution i.e 5 % solution it 5gm added 95 grams for approx 100 cc or 50 gm to 950 cc to make approx 1 litre 5%
Note: for most purposes its close enough to add the required amount of sugar to the full volume I.E. 2 gm added to 100 cc the difference is so miniscule 1.9607843%
dont forget usually we are not dealing with pure water tap water is not pure but its close enough, of course if you have RO you can get right down into the accuracy but generally its not needed
hope this helps