how many grams of sodium chloride are there in 2.5 L of a 0.4% w/v solution?. need to know how to figure this out
I get one gram..but I thimk I am doing this wrong
0.4% w/v solution = .4 grams of sodium chloride per 100mL of solution
.4g/[(100/1000)L] = ?g/(2.5L)
I divided 100 by 1000 to get liters. Cross multiply and solve for the number of grams of sodium chloride.
This will give you a better sense of percentage by weight:
http://www.sciencecompany.com/lab/test_solns.htm
so I would set it up like
4g ?
---- -----
10L 2.5L
so i did 4 x 2.5 = 10 / 10 = 1 gr. is this right?
the numerator was supposed to be 0.4 g
the 10L denominator you computed is incorrect, 100/1000 = .1 L
Instead you'll have this when you cross multiply:
(0.4g)*(2.5L)=(?g)(.1 L)
Oh, so now I have 0.016 grams. I think I got it now..thanks :)
To calculate the grams of sodium chloride in a 0.4% w/v (weight/volume) solution, you need to follow these steps:
Step 1: Determine the volume of the solution in liters.
In this case, it is given that the solution has a volume of 2.5 L.
Step 2: Identify the concentration percentage, which is 0.4% w/v.
This means that 0.4 grams of sodium chloride is present in every 100 mL of solution.
Step 3: Convert the volume from liters to milliliters.
Since the concentration is given in terms of grams per 100 mL, we need to convert 2.5 L to milliliters. There are 1000 mL in 1 L, so 2.5 L is equal to 2,500 mL.
Step 4: Calculate the grams of sodium chloride in the solution.
Now, we can use the concentration percentage to find the grams of sodium chloride.
0.4 grams are present in every 100 mL of solution, so we need to set up a proportion with the known values:
0.4 grams x
----------- = ------
100 mL 2,500 mL
Cross-multiplying and solving for x, we get:
x = (0.4 grams * 2,500 mL) / 100 mL
x = 10 grams
Therefore, there are 10 grams of sodium chloride in 2.5 L of a 0.4% w/v solution.