This question relates the change in color of the litmus paper when it is dipped in solutions of different pH values. In general, a blue litmus paper turns red when dipped in acidic solution and a red litmus paper turns blue when dipped in a basic or alkaline solution. The color of the neutral litmus paper is purple.
Note that the color change takes place between a pH of 4.5 and 8.3, thus, the paper...
This question relates the change in color of the litmus paper when it is dipped in solutions of different pH values. In general, a blue litmus paper turns red when dipped in acidic solution and a red litmus paper turns blue when dipped in a basic or alkaline solution. The color of the neutral litmus paper is purple.
Note that the color change takes place between a pH of 4.5 and 8.3, thus, the paper remains blue above a pH of 8.3 and red, below a pH of 4.5.
Also, remember that pH is related to the hydrogen ion concentration of a solution as:
`pH = -log_10[H^+]`
For these cases, where the hydrogen concentration is given, convert them to pH.
For case A:
pH = `-log_10[1.3 xx 10^(-9)]`
or, pH = 8.9
Thus, the red litmus will turn blue, while blue litmus paper will show no change.
Similarly, for case C: pH = -log(1 x 10^-7) = 7.
The pH is around neutral and hence the red litmus as well as the blue litmus paper will exhibit no change in color.
Similarly, for solutions E and F, pH = 7 and hence the litmus papers will show no change of color.
For case D, pH =4.5, hence red litmus will have no change, while blue litmus paper will turn red.
Similarly, all other cases can also be solved.
Hope this helps.
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