You want to purify 10.0 g of benzoic acid that has been contaminated with 0.2 g of salicylic acid According to the Merck Index, water solubilities of the two compounds are as follows:

Benzoic acid H20 Solubility (g/10 mL) Salicylic acid H20 Solubility (g/10 ml) Temperature (°C)
0.029 0.020 20
0.221 80
0.680 95

a. What volume of boiling water (mL) is needed to dissolve the 10.0 g of benzoic acid?
b. When the water is cooled back to room temperature what percentage of the original benzoic acid and salicylic acid remain in solution?

Ans: A. Adding more batteries will increase the current.

A series circuit is one in which the electrical devices like resistors, batteries etc are connected in series i.e. in a row. In such circuits, there is only one path through which the charge or current can flow.

Based on Ohm's law, the current (I) flowing through a circuit is given by:

I = V/R

where V = voltage and R = resistance

For a series circuit, the total voltage is equal to the sum of individual voltages

V = V1+V2+V3+...

Therefore,

I = [V1+V2+V3+..]/R

Thus, adding more batteries will increase V and hence increase the current (I).