Question

Look at this graph again and determine which solute best fits each description.



(5 points)
Potassium bromide, KBr
Potassium nitrate, KNO3
Has a solubility of approximately 100 grams per 100 grams of water at 60°C.


Has a more positive slope and is more affected by the addition of heat in terms of solubility.


Considering y-intercept form for the slope of a line, y = mx + b
, has a y-intercept of 12 g/100g of water.


Has a lower slope and is less affected by the addition of heat in terms of solubility.


Has a solubility of approximately 60 g per 100 grams of water at 20°C.

Answer 1

Has a solubility of approximately 100 g per 100 g water at 60°C. — Potassium nitrate (KNO3).
Has a more positive slope and is more affected by the addition of heat in terms of solubility. — Potassium nitrate (KNO3).
Considering y-intercept form y = mx + b, has a y-intercept of 12 g/100 g water. — Potassium nitrate (KNO3).
Has a lower slope and is less affected by the addition of heat in terms of solubility. — Potassium bromide (KBr).
Has a solubility of approximately 60 g per 100 g water at 20°C. — Potassium bromide (KBr).

(Justification: KNO3’s solubility curve is much steeper and has a low y‑intercept ≈12 g/100 g H2O; KBr’s curve is flatter and gives about 60–70 g/100 g H2O near 20°C.)