prepare some 0.1 HCl by diluting the appropriate volume of stock 'conc' HCl to 1L. The stock acid is 37.4% HCl by weight and has a density of 1.19g/mL . Measure out the required volume with a graduated clyinder

0.1 WHAT HCl? 0.1M, 0.1N, 0.1m, 0.1% w/w 0.1% w/v.

I will assume 0.1 M.
I would calculate the molarity of the stock HCl first.
1.19 g/mL x 1000 mL x 0.374 x (1 mol/36.5) = ?M
Then use the dilution formula which is
M1V1 = M2V2

To prepare 0.1 HCl by diluting the stock 'conc' HCl, follow these steps:

1. Determine the amount of HCl needed for the desired concentration. We want to prepare 1L of 0.1 HCl solution.

2. Calculate the mass of HCl needed using the percentage by weight and the desired volume of the solution:
Mass of HCl = (Desired concentration * Desired volume * 100) / Percentage HCl by weight
Mass of HCl = (0.1 * 1000 * 100) / 37.4

Note: The desired volume is in mL, and the mass of HCl is in grams.

3. Determine the volume of the stock 'conc' HCl needed to obtain the required mass of HCl. Given that the density of the stock HCl is 1.19 g/mL, we can use the formula:
Volume of 'conc' HCl = Mass of HCl / Density of 'conc' HCl

Make sure to convert the mass of HCl to grams if it is given in milligrams or kilograms.

4. Measure the calculated volume of 'conc' HCl using a graduated cylinder. Be careful when handling the concentrated acid, as it is corrosive and can cause harm. Use proper safety precautions and protective equipment.

5. Transfer the measured volume of 'conc' HCl to a 1L container.

6. Dilute the concentrated HCl by adding distilled water to the 1L container until the total volume reaches 1L.

7. Mix the solution thoroughly to ensure proper dilution.

Now you have successfully prepared 0.1 HCl by diluting the appropriate volume of stock 'conc' HCl to 1L. Remember to handle the acids with caution and dispose of them properly according to safety guidelines.