how will u prepare 500g of aqueos solution which is 10% NaOH by mass?(%W/W)
You want to weigh out 10 g NaOH and add enough water to make a total of 100 g for a 10% solution. Since you want 500 g of solution, just multiply both solute and solvent by 5.
To prepare a 500g aqueous solution of 10% NaOH by mass (%W/W), you will need to follow these steps:
Step 1: Determine the mass of NaOH needed.
Since the solution is 10% NaOH by mass, the mass of NaOH in the solution can be calculated as:
Mass of NaOH = 10% × Mass of solution
Mass of NaOH = 10% × 500g
Mass of NaOH = 50g
Step 2: Weigh out 50g of NaOH.
Using a balance or scale, measure out 50g of NaOH crystals.
Step 3: Dissolve NaOH in water.
Add the 50g of NaOH to a container or beaker. Slowly add distilled water while stirring until the NaOH is completely dissolved. The final volume of the solution may vary depending on the density of the solution.
Step 4: Calculate the total volume of the solution.
To find the total volume of the solution, you will need to know the density or specific gravity of the solution. Suppose the density is 1g/mL, then the total volume of the solution can be calculated as:
Total volume of solution = Mass of solution / Density of solution
Total volume of solution = 500g / 1g/mL
Total volume of solution = 500mL
Step 5: Mix the solution thoroughly.
Continue stirring the solution until the NaOH is completely dissolved and distributed evenly in the solution.
After following these steps, you will have prepared a 500g aqueous solution of 10% NaOH by mass.
To prepare a 10% NaOH solution by mass, you will need to dissolve a specific amount of NaOH in water. Here's how you can determine the amount of NaOH and water needed:
Step 1: Understand the meaning of a 10% NaOH solution by mass. It signifies that in 100 grams of the solution, 10 grams will be NaOH and the remaining 90 grams will be water.
Step 2: Calculate the amount of NaOH needed. Since you want to prepare a 500g solution, multiply 500g by 10% (or 0.10) to find the amount of NaOH required:
500g * 0.10 = 50g
So, you will need 50g of NaOH for the solution.
Step 3: Calculate the amount of water needed. Since the total solution weight is 500g and the amount of NaOH is 50g, the remaining weight will be water:
500g - 50g = 450g
So, you will need 450g of water.
Step 4: Dissolve the NaOH in water. Carefully add the 50g of NaOH to 450g of water, stirring until it fully dissolves. Make sure to follow safety precautions, as NaOH is a caustic substance.
Now, you have prepared a 500g aqueous solution with 10% NaOH by mass.