An acid-base indicator has a `K_(a)` of `3.0 xx 10^(-5)`. The acid form of the indicator is red and the basic form is blue. (a) By how much must the `pH` change in order to change the indicator from `75%` red to `75%` blue?
Bromothymol blue is an indicator with a K_(a) value of 6xx10^(-5). What % of this indicator is in its basic form at a pH of 5 ?
Name an indicator which is red in acid solution but turns blue in basic solution
A copper wire has diameter 0.5 mm and resistivity of 1.6xx10^(-8) How much dows the resistence change if the diameter is doubled?
A copper wire has diameter 0.5 mm, and resistivity of 1.6xx10^-8 ohm -m . What will be the length of this make its resistance 10 ohm ? How much does the resistance change if the diameter is doubled.
An acid-base indicator which is a weak acid has a pK_(In) value =5.45. At what concentration ratio of sodium acetate to acctic acid would the indicator show a colour half-way between those of its acid and conjugate base forms ? [pK_(a) of acetic acid =4.75, log 2=0.3]
Acid-base indicators are either weak organic acids or weak organic bases. Indicator change colour in dilute solution when the hydonium ion concentration reaches a particular calur For example. Phenolphthalein is a coloureless stbstance in any aqueous solution with a pH less than 8.3 In between the pH range 8.3 to 10, transition of colour (colourless to pink ) takes place and if pH of solution is greater than 10 solution is dark pink. Considering an acid indicator Hln, the equilibrium involving it and its conjgate base In^(-) can be represented as : " " underset("acidic from")(HIn)hArrH^(+)underset("basic from")(In^(-)) pH of solution can be computed as : " " pH=pK_(In)+log.([IN^(-)])/([HIn]) In general, transition of colour takes place in between the pH range pK_(In+-1. Select the correct statement (s) :
The fringe width in a Young's double slit inter pattern is 2.4 xx 10^(-4)m ,when a red ligth of wavelength 6,400 overset @A is used.By how much will it change,if blue ligth of wavelength 4,000 overset@A is used?
The fringe width in a Young.s double slit interference pattern is 2.4 xx 10^(-4) m, when red light of wavelength 6400 overset@A is used. By how much will it change,if blue light of wavelength 4000 overset@A is used?
NARENDRA AWASTHI-IONIC EEQUILIBRIUM-Assertin-Reason Type Questions
