The solution is approximately a 17.36% mass percent solution of \(KClO_3\) in water at 50 degrees Celsius, assuming complete dissolution.
To describe the solution, we can calculate the concentration of the potassium chlorate (\(KClO_3\)) in the water.
1. **Calculate Mass Percent:**
\[ \text{Mass Percent} = \frac{\text{Mass of solute}}{\text{Total mass of solution}} \times 100 \]
\[ \text{Mass Percent} = \frac{42 \, \text{g}}{42 \, \text{g} + 200 \, \text{g}} \times 100 \]
\[ \text{Mass Percent} \approx 17.36\% \]
2. **Temperature Consideration:**
Since the solution is at 50 degrees Celsius, we should check if \(KClO_3\) remains fully dissolved at this temperature or if there is any possibility of it reaching saturation and forming a saturated solution or precipitate.
3. **Solubility Information:**
Verify the solubility of \(KClO_3\) in water at 50 degrees Celsius. If \(KClO_3\) is fully soluble at this temperature, the solution would be a clear and homogeneous liquid.
So, the solution is approximately a 17.36% mass percent solution of \(KClO_3\) in water at 50 degrees Celsius, assuming complete dissolution.