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100 g soil was completely saturated with Al⁺³ (100% of the CEC is occupied with Al⁺³). Any excess Al⁺³was leached from the soil sample. The exchangeable Al⁺³ was then exchanged with K⁺ by adding 1N KCl. The Al⁺³ in the extract was determined by titration with 150 ml of 0.15 N base. Calculate the CEC.

A soil is 75% saturated with Ca⁺² + Mg⁺² + K⁺. 50 g of this soil is titrated with 20 ml of 0.1 N NaOH. Calculate the CEC.

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