Answer:
A. maintain electrical neutrality in the half-cells via migration of ions
Explanation:
Salt bridge -
For an electrochemical reaction , involving an anode and a cathode , both the electrodes are connect via a salt bridge to complete the circuit for the reaction .
One of the very important use of a salt bridge is to maintain the electrical neutrality of the respective half cells , which is achieved by the movement of ions .
Hence , from the given options , the correct option is ( a ) .
<u>Answer:</u> The volume of solution that was used is 271.08 mL
<u>Explanation:</u>
The relationship between specific gravity and density of a substance is given as:

We are given:
Specific gravity of water = 0.830
Density of water = 1.00 g/mL
Putting values in above equation we get:

To calculate the volume of solution, we use the equation:

Density of solution = 0.830 g/mL
Mass of solution = 225 g
Putting values in above equation, we get:

Hence, the volume of solution that was used is 271.08 mL
Isotopes exist due to atoms of the same element having different numbers of neutrons