1.

Which of the following mixtures will have the lowest pH at 298 K?

Answer»

`10 mL 0.05 N CH_3 COOH + 5 mL 0.1 N_4 NH OH`
`5 mL 0.2 N NH _4 CI+ 5 mL 0.2 N NH_4 OH `
`5 mL 0.1 N CH_3 COOH + 10 mL 0.05 N CH_3 COONa `
`5 mL 0.1 N CH_3 COOH + 5mL 0.1 N NAOH`

Solution :
It isacidicbufferpH `=pK_a+ log([CH_3COO^-])/( [CH_3 COOH])`
`PH =pK_a`
` therefore ` thissolutionwill havelowestpH


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