A group of students investigated the effect of soaking small onion bulbs in different concentrations of sodium chloride solution. They peeled off the outer papery leaves of the onion bulbs and divided
the onions into 6 batches, each with 10 onions.
The onions were surface dried with paper towels and weighed. The mean mass of the onions in
each batch was calculated. The onions were then left in sodium chloride solutions for three hours.
After three hours the students surface dried the onions and weighed them again. Their results are
given in Table 2.1.

Calculate the percentage change in mass of the onions that were in the most concentrated solution of sodium chloride. Show your work. Write your answer in Table 2.1.

Explain why the students calculated the percentage change in mass of the onions.

This question is incomplete

Explanation:

This question is incomplete but the missing table of the question is attached in the document below.

To determine the percentage change in mass, the formula below is used

(mean mass after soaking - mean mass before soaking)/mean mass before soaking × 100

Thus, for the last concentration (200 g/dm³) that wasn't calculated

(175 - 183)/183 × 100 = -4.4

The reason for calculating the percentage change in mass of the onions is to know if an increase in concentration of sodium chloride leads to an increase or decrease in size of onions. And from the result, the increase in concentration of the sodium chloride solution led a decrease in size of the onion (thus the reason for the negative sign of the percentage as the concentration increases).

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answer: collecting information/data

reason: the student is going around and asking people questions to collect data

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