in words, describe how you would prepare 250 ml of 2.10 m magnesium chloride solution if you have the pure solute available to you. Show all necessary calculations.

Question

in words, describe how you would prepare 250 ml of 2.10 m magnesium chloride solution if you have the pure solute available to you. Show all necessary calculations.

Answer 1

I assume you know how to do this. If not let me know.

Answer 2

I do not understand how to do this question, no.

Answer 3

But you knew how to calculate the 4.5 M problem and dilute the 14.1 M stock solution. This is a far simpler problem. Again, I assume that is 2.10 M and 2.10 m solution.

You want a 2.10 M solution of MgCl2. M = mols/L solution. You want 500 mL.
How many moles do you want? That's mols = M x L = 2.10 x 0.500 = ?
How many grams is that? grams = mols MgCl2 x molar mass MgCl2 = ?
So you weigh out that many grams MgCl2, transfer the solid (I always tell my students to transfer QUANTITATIVELY) to the 500 mL volumetric flask, add some water, swirl until the solid has dissolved, make to the mark on the flask with distilled (or deionized) water, stopper, mix thoroughly, label. Done.

Answer 4

To prepare a 250 ml of 2.10 M magnesium chloride (MgCl2) solution, follow these steps:

Step 1: Calculate the required amount of solute (MgCl2):
To calculate the amount of MgCl2 needed, we'll use the formula:

Mass (g) = Molarity (M) × Volume (L) × Molar Mass (g/mol)

First, we need to convert the volume from milliliters (ml) to liters (L). Since 1 L = 1000 ml, the volume in liters is:

Volume (L) = 250 ml ÷ 1000 ml/L
= 0.250 L

Next, we can plug in the given values and the molar mass of MgCl2 (95.211 g/mol) into the formula:

Mass (g) = 2.10 M × 0.250 L × 95.211 g/mol

Step 2: Calculate the mass of MgCl2:
Multiply the Molarity, Volume, and Molar Mass as calculated above:

Mass (g) = 2.10 M × 0.250 L × 95.211 g/mol
= 12.509925 g

So, you need approximately 12.51 g of pure MgCl2 to prepare a 250 ml 2.10 M solution.

Step 3: Dissolve the solute:
Take the calculated mass of MgCl2 and dissolve it in sufficient distilled water to make a total volume of 250 ml. Ensure that all the solute is completely dissolved.

Note: When handling chemicals, it is important to follow proper safety precautions, such as wearing protective goggles and gloves, and working in a well-ventilated area.