calculate the grams of 1.8% (m/m) NaCl solution that contains 8.00 g of NaCl
I tried 1.8 times 8.00g divided by 58.44g times 100 my answer is 24.6g rounded to 2 SF is 25g this truned out to be wrong I'm stumped!
m/m ? mass/mass?
if MassSolution*.018=massNaCl
then mass solution=8.00/.018
To calculate the grams of NaCl in a 1.8% (m/m) NaCl solution that contains 8.00 g of NaCl, you can follow these steps:
Step 1: Calculate the mass of the solution.
Since the solution is 1.8% (m/m) NaCl, it means that 1.8 g of NaCl is present in 100 g of the solution. Let's assume the mass of the solution is "x" grams.
So, (1.8 g NaCl)/(100 g solution) = (8.00 g NaCl)/(x g solution)
Cross-multiplying, we have:
1.8 g NaCl * x g solution = 100 g solution * 8.00 g NaCl
Step 2: Solve for "x."
Dividing both sides of the equation by 1.8 g NaCl:
x g solution = (100 g solution * 8.00 g NaCl) / 1.8 g NaCl
x g solution = 800 g NaCl / 1.8
Step 3: Calculate the grams of NaCl in the solution.
To find the grams of NaCl in the solution, we can multiply the mass of the solution (x) by the percentage of NaCl present.
Grams of NaCl = x g solution * (1.8 g NaCl/100 g solution)
Substituting the value of x:
Grams of NaCl = (800 g NaCl / 1.8) * (1.8 g NaCl/100 g solution)
Step 4: Simplify the expression.
Grams of NaCl = (800 g NaCl * 1.8 g NaCl) / (1.8 * 100)
Step 5: Evaluate the expression.
Grams of NaCl = (1440 g² NaCl) / 180
Grams of NaCl = 8 g NaCl
So, there are 8 grams of NaCl in the 1.8% (m/m) NaCl solution that contains 8.00 g of NaCl. Your original calculation is correct.
To calculate the grams of a NaCl solution, you need to consider the concentration and the mass of NaCl present.
Here are the steps to calculate the answer:
1. Start by converting the percentage concentration from mass/mass (m/m) to mass/volume (m/v). Since we are working with a solution, assume a 100 mL volume.
1.8% (m/m) NaCl means that for every 100 g of the solution, there are 1.8 g of NaCl.
So, in a 100 mL (which is equivalent to 100 g) NaCl solution, you have 1.8 g of NaCl.
2. Since the concentration of the solution is given as 1.8% (m/m), we can assume that the 8.00 g of NaCl you mentioned is present in 100 g of the solution.
To find the grams of the solution, we can set up a proportion:
1.8 g NaCl present in 100 g of solution
x g NaCl present in 8.00 g of solution
Cross-multiply to solve for x:
(1.8 g * 8.00 g) / 100 g = 0.144 g
Therefore, the mass of the 1.8% (m/m) NaCl solution that contains 8.00 g of NaCl is 0.144 g.
It seems that you made an error in your calculation by multiplying instead of dividing to convert the concentration to a mass/volume ratio. Using the correct calculation method, the answer is 0.144 g, not 25 g.