Calculate the ph of a solution that is 0.115m benzoic acid and 0.230m sodium benzoate, a salt whose anion is the conjugate base of benzoic acid.

Explanation:

According to the Handerson equation,  

       pH =

Also, as standard value of benzoic acid's

So,    

                    =

                    = 4.19

Therefore, pH =

                   =  

                   = 4.19 + 0.30

                   = 4.49

Thus, we can conclude that the pH of given solution is 4.49.

if the concentration of products is decreased, the equilibrium will shift toward the products). add an inert gas (one that is not involved in the reaction) to the constant-volume reaction mixture: this will increase the total pressure of the system, but will have no effect on the equilibrium condition.

explanation:

the density of gold = 19.3 g/cm3

the relation between density and mass and volume is

density = mass / volume

given :

mass of gold = 13 g

density = 13g / volume = 19.3

volume = 13 /19.3 = 0.67 cm^3

thus volume of gold nugget = 0.67 cm^3