Question

fill in the missing words
a) when dissolved in water one unit of potassium chloride dissociates forming □ potassium ion(s) and □ chloride ion(s) (□ ions total).
b) when dissolved in water one unit of sodium sulfate dissociates forming □ sodium ion(s) and □ sulfate ion(s) (□ ions total).

Explanation:

Part (a)

Step1: Recall KCl dissociation

Potassium chloride ($\ce{KCl}$) dissociates in water as $\ce{KCl -> K+ + Cl-}$. So 1 $\ce{K+}$ and 1 $\ce{Cl-}$.

Step2: Calculate total ions

Total ions = 1 (K⁺) + 1 (Cl⁻) = 2.

Step1: Recall $\ce{Na2SO4}$ dissociation

Sodium sulfate ($\ce{Na2SO4}$) dissociates as $\ce{Na2SO4 -> 2Na+ + SO4^{2-}}$. So 2 $\ce{Na+}$ and 1 $\ce{SO4^{2-}}$.

Step2: Calculate total ions

Total ions = 2 (Na⁺) + 1 (SO₄²⁻) = 3.

Answer:

1, 1, 2

Part (b)