Answer:
B
Explanation:
Look on the x-axis for the tick marked "60". This indicates 60 degrees Celsius, which we want. Now, look on the y-axis for the tick marked "60". This indicates 60 grams of [tex]Na_2HAsO_4[/tex]. Trace along the graph to find where these two places meet at (60, 60).
Now, look for the solubility curve of [tex]Na_2HAsO_4[/tex]; it's the yellow-orange line. Find out what the y-coordinate of the point where x = 60 is on the line: it's around (60, 65).
So, since the point (60, 60) is below the line corresponding to this substance, [tex]Na_2HAsO_4[/tex] is unsaturated.
The answer is B.
