How would I make a 5% solution of sodium bisulfite?
sodium bisulfite: NaHSO3
Molar mass: 104.06 g/mol
is it 5% w/w
or v/v
or w/v
b/c if it was w/w then it would be
weight percent w/w= weight solute/ weight solution* 100
I need help on this
Thanks
I have been told several times that it means w/w if w/w or w/v is not specified (you don't mean v/v because NaHSO3 is a solid). However, for your purposes, I doubt if it makes that much difference.
Is it 5g of the sodium bisulfite mixed with 100ml of solvent?
I mean 5g of sodium bisulfite mixed with 100g of solvent
No, w/w is 5 g NaHSO3 + 95 g solvent for 100 g solution.
but why does the Fundamentals of Analytical Chemistry book state on the w/w page that a "70% solution, which means the reagent contains 70g of HNO3 per 100g of solution" ?
I'm not looking at that page; however, look at it this way.
70% solution means that if we take 100 g of solution, 70% (or 70 g will be the solute and 30 g is the solvent to make 100 g of solution. And that is consistent with making a 70% solution of something, w/w.
To make a 70% w/w solution, we take 70 g solute, add 30 g solvent, to make 100 g solution. In your example and my example,we have 100 g of solution.
okay
Thanks Dr.Bob
need help on cell cycle
To make a 5% solution of sodium bisulfite, you first need to determine the type of percentage you are trying to achieve. In this case, you mentioned three possibilities: w/w (weight/weight), v/v (volume/volume), and w/v (weight/volume).
1. If you want to prepare a 5% w/w solution, it means that the weight of the solute (sodium bisulfite) will be 5% of the total weight of the solution. The formula for weight percent w/w is:
weight percent w/w = (weight of solute / weight of solution) * 100
To find the weight of sodium bisulfite needed, you can use the following steps:
a. Determine the desired total weight of the solution. Let's say you want to prepare 100 grams of the solution.
b. Calculate 5% of the total weight: (5/100) * 100 grams = 5 grams.
c. Measure out 5 grams of sodium bisulfite and dissolve it in enough solvent (e.g., water) to make a total weight of 100 grams.
2. If you want a 5% v/v solution, it means that the volume of the solute will be 5% of the total volume of the solution. Since the density of sodium bisulfite is not provided, you cannot directly apply this calculation method without additional information.
3. If you want a 5% w/v solution, it means that the weight of the solute will be 5% of the total volume of the solution. The formula for weight percent w/v is:
weight percent w/v = (weight of solute / volume of solution) * 100
To find the weight of sodium bisulfite needed, you can use the following steps:
a. Determine the desired total volume of the solution. Let's say you want to prepare 100 mL of the solution.
b. Calculate 5% of the total volume: (5/100) * 100 mL = 5 mL.
c. Measure out 5 grams of sodium bisulfite and dissolve it in enough solvent (e.g., water) to make a total volume of 100 mL.
Remember to always wear appropriate personal protective equipment and follow the necessary safety precautions when working with chemicals.