Questlon 5 of 5 What is the main source of energy for plants?
A. Oxygen
B. Water
C. Soil
D. Sunlight

D Sunlight

Explanation:

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The pH of the mixed buffer will be

= 1.737

Explanation:

Buffer is prepared by mixing solutions of KH₂PO₄ and K₂HPO₄

H₂PO₄⁻ ⇄  HPO₄²⁻ + H⁺

Using Henderson equation

⇒         pH = pKa₂ + log

⇒      7.45  = -log(6.2 x 10⁻⁸) + log

⇒     log = 7.45 - 7.2

⇒           =

⇒          = 1.737

So, pH of Buffer solution is equal to 1.737