A student tested a solution with the indicators methyl orange and litmus. During the testing, the student observed that the methyl orange indicator turned yellow and the litmus indicator turned red. The observations suggest that the solution's pH is between
A. 2.8 and 3.2
B. 3.2 and 4.4
C. 4.4 and 4.5
D. 4.5 and 8.3
and please explain the answer so i can understand! thanks.
A. 2.8 and 3.2
B. 3.2 and 4.4
C. 4.4 and 4.5
D. 4.5 and 8.3
and please explain the answer so i can understand! thanks.
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A pH indicator will show specific colours at different pH ranges:
For instance:
Methyl orange: Red if pH is below 3.1, but yellow if pH is above 4.4
Litmus: Red if pH is below 5.0 and blue if pH is above 8.5
If methyl orange turns sample yellow: pH is above 4.4
If litmus turns sample red, pH is below 5.0
How does this fit you choices?
D looks good = above 4.5 and below 8.3
.
For instance:
Methyl orange: Red if pH is below 3.1, but yellow if pH is above 4.4
Litmus: Red if pH is below 5.0 and blue if pH is above 8.5
If methyl orange turns sample yellow: pH is above 4.4
If litmus turns sample red, pH is below 5.0
How does this fit you choices?
D looks good = above 4.5 and below 8.3
.
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Litmus is red ≤ 4.5 ≤ purple ≤8.3; blue (http://en.wikipedia.org/wiki/Litmus )
Methyl orange turns yellow 3.1-4.4. (http://en.wikipedia.org/wiki/PH_indicato… )
So the pH has to be above 3.1 for the methyl orange to be yellow and
the pH has to be less than 4.5 for the litmus to be red.
So it looks like B.
Methyl orange turns yellow 3.1-4.4. (http://en.wikipedia.org/wiki/PH_indicato… )
So the pH has to be above 3.1 for the methyl orange to be yellow and
the pH has to be less than 4.5 for the litmus to be red.
So it looks like B.