Sinple dilution question, URGENT PLEASE HELP! EXAM IN A COUPLE OF HOURS

Question

You will need to make dilutions of the 1.0 % solution of E (20 cm3 provided), so that the concentration

of E is reduced by 0.2 % between each successive dilution.

You will need 5 cm3 of each concentration.

Prepare the space below to show the:

• concentrations of E

• volumes of E

• volumes of distilled water, W.

[

Answer 1

 Table illustrating the dilution process for preparing successive dilutions of the 1.0% solution of E, where the concentration is reduced by 0.2% in each step. The goal is to obtain 5 cm³ of each diluted concentration:

| Dilution | Concentration of E (%) | Volume of E (cm³) | Volume of W (cm³) |

|----------- |--------------------------------|--------------------------|--------------------------|

| 1 | 1.0 | 5 | 0 |

| 2 | 0.8 | 5 | 0 |

| 3 | 0.6 | 5 | 0 |

| 4 | 0.4 | 5 | 0 |

| 5 | 0.2 | 5 | 0 |

Here's how you can interpret the table:

1. Dilution 1 involves taking 5 cm³ of the original 1.0% solution of E and adding 0 cm³ of water (since you're not diluting it further).
2. For subsequent dilutions (Dilutions 2 through 5), you're taking 5 cm³ of the previously diluted solution and adding an appropriate volume of distilled water to achieve the desired reduction in concentration by 0.2% in each step.

Ensure that you follow proper laboratory techniques for dilution, such as accurate pipetting and thorough mixing, to achieve the desired concentrations.