At `25^(@)C` find pH of resultant solution prepared by mixing 50 ml, 0.2 M kA(aq) and 50 ml, 0.2M kB(aq) solution : (given = `K_(a)(HA)=5xx10^(-9), K_

Question

At `25^(@)C` find pH of resultant solution prepared by mixing 50 ml, 0.2 M kA(aq) and 50 ml, 0.2M kB(aq) solution : (given = `K_(a)(HA)=5xx10^(-9), K_

At `25^(@)C` find pH of resultant solution prepared by mixing 50 ml, 0.2 M kA(aq) and 50 ml, 0.2M kB(aq) solution : (given = `K_(a)(HA)=5xx10^(-9), K_(a)(HB)=1.25xx10^(-9)`)
A. 3
B. 2.5
C. 11
D. 6

Monjur Alahi

4 views

2025-01-04 04:42

1 Answers

Related Questions

An octahedral complex is prepared by mixing `CoCl_3` and `NH_3` in the molar ratio of 1 : 4 . 0.1 m solutioin of this complex was found to freeze at `

2 Answers 4 Views

A bar magnet when placed at an angle of `30^(@)` to the direction of magnetic field of `5xx10^(-2)`T, experiences a moment of couple `2.5xx10^(-6)`. I

2 Answers 5 Views

Concentration of `SO_(4)^(2-)` ions in a solution prepared by mixing `100 ml 0.1 M BaCl_(2)` and `400 ml 0.2 M Na_(2)SO_(4)`.

2 Answers 5 Views

The vepour pressure of ethanol and mthanol are 44.5 mm and 88.7 mm of Hg respectively. A solution prepared by mixing 60 g of ethanol and 40 g of metha

2 Answers 4 Views

The vapour pressure of ethly acetate and ethly propionate are72.8mm abd 27.7mm of Hg respectively. A solution is prepared by mixing 25 g ethly acetate

2 Answers 4 Views

Resultant of two forces when angle between them is `60^(@)` is 6 Newton and if angle between forces increased to `120^(@)` then resultant becomes `sqr

2 Answers 6 Views

If 1 litre of 9.8% w/w `H_(2)SO_(4)` (d = 1.5 g/ml) solution is mixed with 4 litre of 1M KOH solution then pH of resultant solution will be given (log

2 Answers 8 Views

Recently government of India has allowed mixing of alcohol in petrol.What is amout of alcohol permitted for mixing in petrol

2 Answers 5 Views

A system has two charges `q_(A)=2.5xx10^(-7) C` and `q_(B)=-2.5xx10^(-7) C` located at points A, `(0, 0, -0.15 m)` and B, `(0, 0, +0.15 m)` respective

2 Answers 4 Views

सिलिकॉन परमाणुओं की संख्या `5xx10^(28)` प्रति `m^(3)` है। यह साथ ही साथ आर्सेनिक के `5xx10^(22)`परमाणु प्रति `m^(3)` और इडियम के `5xx10^(20)` परमाणु प

2 Answers 4 Views

Salim Ahmed Kawsar · Accepted Answer · 2023-02-05T15:29:48+06:00

Correct Answer - D
`"pH of "(NaHCO_(3))=(1)/(2)[pKa_(1)+pKa_(2)]`
`(1)/(2)[pKa_(1)+pKa_(2)]=9`
`pKa_(1)+underset(LR)(pKa_(2))=18`
`H_(2)CO_(3)+NaOH rarr NaHCO_(3)`
`{:(44,40,,-),(4,0,,40):}`
Buffer `rarr pH = pKa_(1)+log.(40)/(4)`
`pH=pKa_(1)+log.(40)/(4)`
`pH=pKa_(1)+log10`
`7.6 = pKa_(1)+1`
`pk_(a_(1))=6.6`
`18=6.6 + pk_(a_(2))`
`pk_(a_(2))=11.4`