select the correct answer.\na solution has a ph of 4.20. using the relationship between ph and poh, what is…

select the correct answer.\na solution has a ph of 4.20. using the relationship between ph and poh, what is the concentration of oh⁻?\n○ a. 9.9×10⁻¹ m\n○ b. 6.2×10⁻¹ m\n○ c. 6.3×10⁻⁵ m\n○ d. 6.7×10⁻⁶ m\n○ e. 1.6×10⁻¹⁰ m

select the correct answer.\na solution has a ph of 4.20. using the relationship between ph and poh, what is the concentration of oh⁻?\n○ a. 9.9×10⁻¹ m\n○ b. 6.2×10⁻¹ m\n○ c. 6.3×10⁻⁵ m\n○ d. 6.7×10⁻⁶ m\n○ e. 1.6×10⁻¹⁰ m

Answer

Explanation:

Step1: Calcular pOH

Sabemos que pH + pOH = 14. Dado que pH = 4.20, entonces pOH = 14 - pH. pOH = 14 - 4.20 = 9.80

Step2: Calcular concentración de OH⁻

La relación entre pOH y la concentración de iones OH⁻ es $[OH^-]=10^{-pOH}$. $[OH^-]=10^{- 9.80}$ $[OH^-]=1.58\times10^{-10}\approx1.6\times10^{-10}\ M$

Answer:

E. $1.6\times10^{-10}\ M$