Asample of nickel is heated to 99.8 degrees c and placed in a coffee cup calorimeter containing 150.0g water at 23.5 degrees c. after the metal cools, the final temperature of metal andwater mixture is 25.0 degrees c. if the specific heat capacity of nickel is 0.444j/(degreescg),
what mass of nickel was originally heated?

28.3 grams

Explanation:

As we know that,  

        .................(1)

where,

q = heat absorbed or released

= mass of water= 150.0 g

= mass of nickel = ?

= final temperature =

= temperature of water =

= temperature of nickel =

= specific heat of water =

= specific heat of nickel=

Now put all the given values in equation (1), we get

Therefore, the mass of nickel originally heated was 28.3 grams

the dissociation of nickel hydroxide is follows:

the concentration of hydroxide ion is

the equilibrium constant value of nickel hydroxide is = 6.1 * 10^-^1^6 and thus equilibrium equation can be written as:

thus, concentration of ni is 0.23 * 10^-^4 mol /l