10. (20,178
11. When the boy is about 18-20
I think those are right hope this helps
According to Arrhenius concept a base is one which can donate hydroxide ion in its aqueous solution.
Here NaOH is a base as it can donate OH-.
As NaOH is a strong base it will have very high dissociation constant.
Due to high dissociation constant if will almost completely dissociate into sodium ions and hydroxide ions.
Thus in a solution of NaOH we will expect the following two ions
Na^{+} + OH^{-}[/tex]
Given:
Density:8.92g/cm3
Volume:25.8 mL
Now we know that
Mass = density X volume
Substituting the given values in the above equation we get:
Mass = 8.92 x 25.8= 230.136 g
= 230136 mg
Answer:
0.5
Explanation: (3) Factors affecting transport number (i) Temperature: A rise in temperature tends to bring the transport number of cation and anion more closely to 0.5