How do I prepare 10% w/v HCl from 37%(w/w) HCl (density 1.19g/ml)?

Thanks.

For a 10 w/v% solution, we want 10 g solute in 100 mL solution.

To obtain 10 g HCl from 37% solution, we need to take 10/(0.37*1.19) = 22.7 g of the concd solution.
(Check: 22.7 mL x 1.19 g/mL x 0.37 = 10 grams.)
Make the final volume to 100 mL and you will have 10 g/100 mL which is a 10%(w/v) solution. Check my thinking.

Sorry,final volume of 10% w/v HCl required is 100ml.

To prepare a 10% w/v HCl solution from 37% w/w HCl, you will need to dilute the concentrated HCl with water. Here's the step-by-step process:

Step 1: Determine the volume of 37% HCl needed for the preparation.
- Let's assume you want to prepare 100 ml of 10% HCl solution.

Step 2: Calculate the amount of HCl in the 37% HCl solution.
- Since the 37% HCl solution has a density of 1.19 g/ml, this means that 1 ml of the solution contains 1.19 grams of HCl.
- So, for the volume chosen in Step 1 (100 ml), the amount of HCl is:
Amount of HCl = volume × density = 100 ml × 1.19 g/ml = 119 grams

Step 3: Calculate the amount of water needed.
- The final volume of the solution will be the volume of the 37% HCl solution plus the volume of water added.
- In this case, the final volume is 100 ml, and the volume of the 37% HCl solution is also 100 ml (as assumed).
- Therefore, the volume of water needed is:
Volume of water = final volume - volume of 37% HCl solution = 100 ml - 100 ml = 0 ml

Step 4: Dilute the HCl and water to prepare the 10% w/v HCl solution.
- Take the calculated amount of HCl (119 grams) and dissolve it in the calculated volume of water (0 ml).
- Stir the mixture thoroughly until the HCl is completely dissolved.

Step 5: Verify the concentration of the prepared solution.
- Measure the volume of the prepared solution and calculate its concentration by dividing the mass of HCl by the volume of the solution.
- In this case, for the assumed 100 ml final volume, you would have:
Concentration of HCl = (119 grams / 100 ml) × 100% = 119%

By following these steps, you should be able to prepare a 10% w/v HCl solution from the given 37% w/w HCl solution.

To prepare a 10% (w/v) HCl solution from 37% (w/w) HCl, you need to dilute the concentrated HCl solution with water. Here's how you can calculate the amount of concentrated HCl and water required:

1. Determine the volume (V1) of the concentrated HCl solution needed. Let's assume you want to prepare 100 mL of the 10% HCl solution.

2. Calculate the volume (V2) of the concentrated HCl solution required. This can be done using the equation:

V2 = (C2 * V1) / C1

C1 = Initial concentration of HCl (% w/w) = 37%
C2 = Desired concentration of HCl (% w/v) = 10%

Using the values from above:
V2 = (10 * 100) / 37
V2 ≈ 27.03 mL

So, you need to measure 27.03 mL of the concentrated HCl solution (37% w/w) to prepare the desired 10% w/v HCl solution.

3. Now, calculate the volume of water (V_water) required to complete the solution:
V_water = V1 - V2
V_water = 100 mL - 27.03 mL
V_water ≈ 72.97 mL

Therefore, you need to add approximately 72.97 mL of water to the 27.03 mL of concentrated HCl solution to obtain a final volume of 100 mL of 10% w/v HCl solution.

Note: It is crucial to follow proper safety precautions when dealing with concentrated acids like HCl. Always add acid to water slowly and carefully, and wear appropriate protective gear.