how many mL of 1M HCL is used to make:

100mL of 0.1M hcl
250Ml OF 0.5M hcl
10Ml OF 0.01m hcl

There is a simple dilution formula you can use for all of these.

c1v1 = c2v2
c = concentration
v = volume
1M x ?mL = 0.1M x 100 mL
?mL = (0.1M x 100 mL)/1M = 10 mL

To calculate the amount of 1M HCl needed to make a specific concentration of HCl solution, you can use the formula:

C1V1 = C2V2

Where:
C1 = initial concentration of HCl
V1 = initial volume of HCl
C2 = final concentration of HCl
V2 = final volume of HCl solution

Let's go through each scenario step by step:

1. For 100 mL of 0.1M HCl:
C1 = 1M
V1 = ?
C2 = 0.1M
V2 = 100 mL

Using the formula C1V1 = C2V2:
1M × V1 = 0.1M × 100mL
V1 = (0.1M × 100mL) / 1M
V1 = 10 mL

Therefore, you need 10 mL of 1M HCl to make 100 mL of 0.1M HCl.

2. For 250 mL of 0.5M HCl:
C1 = 1M
V1 = ?
C2 = 0.5M
V2 = 250 mL

Using the formula C1V1 = C2V2:
1M × V1 = 0.5M × 250mL
V1 = (0.5M × 250mL) / 1M
V1 = 125 mL

Therefore, you need 125 mL of 1M HCl to make 250 mL of 0.5M HCl.

3. For 10 mL of 0.01M HCl:
C1 = 1M
V1 = ?
C2 = 0.01M
V2 = 10 mL

Using the formula C1V1 = C2V2:
1M × V1 = 0.01M × 10mL
V1 = (0.01M × 10mL) / 1M
V1 = 0.1 mL

Therefore, you need 0.1 mL of 1M HCl to make 10 mL of 0.01M HCl.