Question

question 4 of 12
sci_phys_cfa2_propertiesofma...
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mass
10
0
0 20 25 30 35 40
temperature (°c)
which statement best compares the solubility of these substances?
kcl is more soluble at 20°c than nacl is
kcl will become less soluble at temperatures greater than 40°c
both substances have the same solubility from 20°c through 40°c
both substances are equally soluble at 30°c

Explanation:

To answer this, one would need to analyze the solubility - temperature graph (not fully visible here). But by looking at the options:

• Option 1: There is no information to compare solubility of KCl and NaCl at 20°C.
• Option 2: There is no indication of what happens above 40°C.
• Option 3: Without full graph details, we can't say for sure about 20 - 40°C range.
• Option 4: If the graph shows that the solubility curves of the two substances intersect at 30°C, then they are equally soluble at 30°C. This is the most reasonable option based on the information we have.

Answer:

Both substances are equally soluble at 30°C.