I would say that the first answer choice makes sense since the charge of Oxygen is +2. But I may be wrong, try it out!
Answer:
Is pink in base solution, it provides a visual signal that a solution has changed from acid to a base, is colorless in acid solution.
Explanation:
As all the indicator, phenolphtalein has the property that turns pink when the solution that you have reaches a value of a pH of 9 or above. From 0 to 8 in a pH scale, is colorless. This point in which an indicator changes is it called equivalence point.
Well i think the answer to that is theory
Answer: <span>option C. Measure the four products separately, but using the
same scale each time.
</span>
Justification:
Review the choices given one by one.
<span> A. Measure the product separately
on four different scales.
</span><span>
</span><span>
</span><span>He should not include other variables in the experiment. Using four different scales migh give different results due to differences on the scales.
</span><span>
</span><span>B. Measure all of the product together and
divide by four.
</span><span>
</span><span>
</span><span>By doing this he will just obtain an average of the amount produced, but in this way he cannot determine the production individually (with each catalyst).
</span><span>
</span><span>
</span><span>C. Measure the four products separately, but using the
same scale each time.
</span><span>
</span><span>
</span><span>Indeed doing this he will be able to compare and rank the efficiency of each catalyst.
</span><span>
</span><span>
</span><span>D. Measure the amount of sodium chloride in one
sample every 10 seconds.
</span>
He cannot do this without affecting at the same time the evolution of the reaction, and of course by doing it on one sample only he will not be able to compare.
