Question

write a balanced equation for the double - replacement precipitation reaction described, using the smallest possible integer coefficients. a precipitate forms when aqueous solutions of copper(ii) chloride and potassium hydroxide are combined. be sure to include states such as (s) or (aq).

Explanation:

Step1: Identify reactants and products

Copper(II) chloride ($CuCl_2(aq)$) and potassium hydroxide ($KOH(aq)$) react. The products of a double - replacement reaction are copper(II) hydroxide ($Cu(OH)_2(s)$) which is a precipitate and potassium chloride ($KCl(aq)$).

Step2: Write the unbalanced equation

$CuCl_2(aq)+KOH(aq)
ightarrow Cu(OH)_2(s)+KCl(aq)$

Step3: Balance the equation

To balance the chlorine atoms, we need 2 moles of $KCl$. So we put a 2 in front of $KCl$. Then, to balance the potassium atoms, we need 2 moles of $KOH$.
$CuCl_2(aq) + 2KOH(aq)
ightarrow Cu(OH)_2(s)+2KCl(aq)$

Answer:

$CuCl_2(aq)+2KOH(aq)
ightarrow Cu(OH)_2(s) + 2KCl(aq)$