If each washer has a mass of 4.9 g, then the mass of two washers in kilograms would be . Given that F = ma, and if 4 washers are
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The hydroxide ion concentration, [OH-] = 2.439 x 10⁻¹⁰
<h3>Further explanation</h3>Equilibrium of water and the ions :
Kc[H₂O] is the ion equilibrium constant for water ⇒ Kw.
The product of the concentrations of these ions (H₃O⁺ and OH⁻)at equilibrium at 25°C is 1.0 x 10⁻¹⁴ M
[H₃O⁺] [OH⁻] = 1.0 x 10⁻¹⁴ M = Kw
The hydrogen ion concentration of [H⁺]=4.1 x 10⁻⁵ M, so the hydroxide ion concentration, [OH-] :