From the following table {:("Buffer solution ", "Vol .of 0.1 M weak acid ", "Vol. of . 0.1 M sodium salt of weak acid "),(I,4.0, 4.0 ),(II, 4.0,40.0 ),( III, 40.0 , 4.0),(IV, 0.1,10):} Which of the two sets of buffer solutions have least pH ?

From the following table {:("Buffer solution ", "Vol .of 0.1 M weak ac

1.	From the following table {:("Buffer solution ", "Vol .of 0.1 M weak acid ", "Vol. of . 0.1 M sodium salt of weak acid "),(I,4.0, 4.0 ),(II, 4.0,40.0 ),( III, 40.0 , 4.0),(IV, 0.1,10):} Which of the two sets of buffer solutions have least pH ?
Answer» `I & II` ` I & III` ` II &III` ` II & IV ` Solution :Buffer -1 ` PH =P^(ka)j+log ""(4)/(4)rArr pH =P^(Ka) ` Buffer -2 ` pH = P^(Ka)+log ""( 40)/(4)rArr pH=P^(Ka)+1` Buffer -3 ` pH =P^(Ka) +log ""(4)/(40 ) rArrpH =P^(Ka) -1 ` Buffer -4` pH =P^(Ka) +log ""(10)/(0.1)rArrpH= P^(Ka+2)`