By the end of this lab, you will determine whether you should add cocoa mix (a solid) before or after heating water (liquid) to
2 answers:
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Answer:
B. pOH = 14 - pH and D. pH = 14 - pOH.
Explanation:
Hello,
In this case, we must remember that pH and pOH are referred to a measure of acidity and basicity respectively, since pH accounts for the concentration of H⁺ and pOH for the concentration of OH⁻ in a solution. In such a way, since the maximum scale is 14, we say that the addition between the pH and pOH must be 14:
Therefore, the correct answers are B. pOH = 14 - pH and D. pH = 14 - pOH since the both of them are derived from the previous definition.
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<u>Answer:</u> The mass of the substance that must be added is 75.2 grams.
<u>Explanation:</u>
Elevation in boiling point is defined as the difference in the boiling point of solution and freezing point of pure solution.
The equation used to calculate elevation in boiling point follows:
= ? °C
Boiling point of pure water = 100°C
Boiling point of solution = 101.54°C
Putting values in above equation, we get:
To calculate the elevation in boiling point, we use the equation:
Or,
where,
= 1.54°C
i = Vant hoff factor = 1 (For non-electrolytes)
= molal boiling point elevation constant = 0.512°C/m.g
= Given mass of solute = ? g
= Molar mass of solute = 50.0 g/mol
= Mass of solvent (water) = 500 g
Putting values in above equation, we get:
Hence, the mass of substance that must be added is 75.2 grams.