Answer:
Explanation:
To neutralize a chemical to a pH of 7 before discarding, one would require a significant amount of acids or bases. Our best guess is that the solution in itself is either an acid or a base. Neutralization with the right amount of a proper reagent can bring the pH of the solution to a neutral 7.
If the solution has a pH originally greater than 7, add a corresponding amount of acid to it. This will reduce the concentration and bring it to a neutral point. Provided one is dealing with a solution of pH less than 7, simply add a base to to bring the solution to neutrality.
1.267 x 10 ^ 24 is the total number of atoms
Half-life is defined as the amount of time it takes a given quantity to decrease to half of its initial value. The equation to describe the decay is
Nt=N0(1/2)
where N0 is the initial quantity, Nt is the remaining quantity after time t, t1/2 is the half-time. So work out the equation, t1/2 = t (-ln2)/ln(Nt/N0) = 11.5*(-ln2)/ln(12.5/100) = 3.83 days
The formula of Cobalt oxide is ZnO.
2Co(s) + O2(g) ----> 2CoO(s)
It is in solid state. It contains one atom of Cobalt and one atom of Oxygen.It is basic in nature because it is a metal oxide. It is black coloured powder. As we know that metal oxides are basic in nature.
CoO(s) + H2O (l) ---> Co(OH)2
It's solution turns red litmus paper into blue which proves that it is a base.
