Respuesta :
Answer:
Dissolve 47.025 grams of sucrose in enough water to produce 250 ml of solution.
Explanation:
You need to prepare 250. mL of a 0.550 M aqueous solution of sucrose, C12H22O11 (aq),
which is used frequently in biological experiments.
Based on your answer above, what is the value of x?
Solution:
A 0.550 M aqueous solution contains 0.550 mole of sucrose per liter of solution.
250 ml = 0.250 liter
Thus a 0.250 liter of a 0.550 M aqueous solution of sucrose contains 0.250 * 0.550 = 0.1375 mole of sucrose
Recall:
Mass = number of moles * mass of 1 mole
mass of 1 mole of C12H22O11
= 12(12) + 1(22) + 16(11)
= 144 + 22 + 176
= 342 grams
Mass = 0.1375 * 342 = 47.025 grams of sucrose.
Dissolve 47.025 grams of sucrose in enough water to produce 250 ml of solution.
When making a solution of a specific volume or quantity, it is important that the solvent is added to the solute when it has completely dissolved. That is the solvent is added first to the vessel
The correct responses to the questions are;
- C. Volumetric flask
- Measure out x g of solid sucrose on a balance
- x is approximately 47.066 g
- Mix a small amount of water with the solute to dissolve it, then fill with water to the 250-mL mark
The reason the above options are correct is as follows:
The giving parameter are;
The volume of solution to be prepared, V = 250 mL = 0.250 L
The concentration of the solution to be prepared, n = 0.550 M
Chemical formula of the compound, sucrose, to be prepared = C₁₂H₂₂O₁₁
Question: Base on online research, parts of the question appear missing and are therefore, included here as follows;
a. The type of glassware to be used to make the solution, for higher accuracy
A. A beaker
B. Erlenmeyer flask (conical flask)
C. Volumetric flask
Solution:
The vessel used to make solutions of accurate volume in the lab is the volumetric flask, which is option C.
C. Volumetric flask
A volumetric flask has calibration for making accurate or precise measurement of the liquid it contains
b. Required:
How the amount of solute required is to be corrected:
Solution:
Sucrose is a white crystalline solid substance that can be transferred with the use of spatula unto a balance where the mass is measured
Therefore, the correct response is;
Measure out x g of solid sucrose on a balance
c. Required:
The value of x in the x gram of sucrose to b measured
Solution;
The correct amount of solute, x, to be measured is found as follows
The mass of sucrose required, m = n × V × MM
Where;
MM = The molar mass of the sucrose = 342.2965 g/mol
x = 0.550 mol/L × 0.250 L × 342.2965 g/mol ≈ 47.066 g
x ≈ 47.066 g
d. Required:
The method by which the solute and the solvent are to be mixed in the container
Solution:
The method by which the solute and the solvent are mixed so that the volume of the total mixture is 250 mL is as follows;
It is important to add water unto the solute already in the flask so that the total volume of the solvent and solute combined is 250 mL
However, it is also important to first dissolve the solute in a small amount of water, so as to provide enough space for swirling of the liquid without spilling it
When all the sucrose has dissolved, water can then be added to fill the flack to the 250 mL mark
Therefore, the correct option is to mix a small amount of water with the solute to dissolve it, then fill with water to the 250-mL mark.
Learn more about mixing chemical solutions here:
https://brainly.com/question/21661958
