Prepare a potassium phosphate stock solution with a pka value of 7.2 and ph value of...

Prepare a potassium phosphate stock solution with a pka value of 7.2 and ph value of 7.0. calculate the amount of monobasicpotassium phosphate amount required for 100ml of a 1M solution and th amount of dibasic phosphate amount required for 25ml of a 1M solution?

Expert Solution

To calculate the amount of monobasic potassium phosphate , molecular weight of monobasic potassium phosphate= 136.086g

Required amount 100ml(0.100L) of 1M (whereM=moles/L) solution:

= 0.100L× 1Mol monobasic potassium phophate× 136.086g/L× Mol

= 13.608g

13.608g is required for 100ml of 1M solution to be prepared.

To calculate the amount required for dibasic phosphate, molecular weight of dibasic phosphate (Na2HPO4) = 141.96g

Required amount is 25ml( 0.025 Litres) of 1M solution:

= 0.025L×1Mol dibasic phosphate×141.96g/L×mol

= 3.549g

3.549g of dibasic phosphate is required for 25ml of 1M solution to be prepared.

queen_honey_blossom answered 2 years ago

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