In order to measure the absorption spectrum of CoCl2, you need to dilute the stock solution to 0.32 M. What volume of the stock solution (0.8 M concentration) and water should be mixed to make a 10 mL solution of 0.32 M?

Explanation:

Volume of stock solution needed

= 10mL * (0.32M/0.8M)

= 10mL * (4/10) = 4mL.

Volume of water needed

= 10mL - Volume of stock solution

= 10mL - 4mL = 6mL.

option a is correct i.e.

explanation:

in context to the membrane of nerve impulse, the outer membrane of neuron is semi permeable that is only sodium ions can pass through the membrane i.e. smaller ions can pass through the membrane while larger ions cannot pass through it.

a compound light microscope is used to magnify objects in steps.  

hope it