How do you make a 3 m solution of kbr? How many moles of kbr are in 1 liter of a .03 m solution?
Are you looking for a 3m or 3M solution?
Is that 0.03m or 0.03M?
To make a 3 M solution of KBr (Potassium Bromide), you need to know the molar mass of KBr and the desired volume of the solution. Here are the steps to make a 3 M KBr solution:
1. Determine the molar mass of KBr: The molar mass of K (Potassium) is approximately 39.1 g/mol, and the molar mass of Br (Bromine) is approximately 79.9 g/mol. So, the molar mass of KBr is 39.1 + 79.9 = 119 g/mol.
2. Calculate the mass of KBr needed: To make a 3 M solution, you need 3 moles of KBr in 1 liter (1000 ml) of the solution. The formula to calculate the mass of KBr is mass = moles × molar mass. Therefore, the mass of KBr required is 3 moles × 119 g/mol = 357 g.
3. Dissolve the KBr in a solvent: Measure 357 grams of KBr using a balance and add it to a container. Then, add enough solvent (typically water) to achieve a final volume of 1 liter. Stir the solution until all the KBr is completely dissolved.
Now, let's calculate the number of moles of KBr in 1 liter of a 0.03 M solution:
A 0.03 M solution means that there are 0.03 moles of KBr dissolved in 1 liter of the solution.
To calculate the moles of KBr in 1 liter, we need to multiply the concentration (moles per liter) by the volume:
Moles = concentration × volume
Moles = 0.03 moles/L × 1 L = 0.03 moles
Therefore, there are 0.03 moles of KBr in 1 liter of a 0.03 M solution.