Answer:
0.196 M
Explanation:
First, we have to calculate the moles of sodium hydroxide.
moles = mass / molar mass
moles = 3.9280 g / (39.997 g/mol) = 0.098207 mol
It is important to realize that even though 300 mL is the volume of water firstly added to dissolve the hydroxide, the flask is then filled to the mark, meaning that the volume of the solution is 500 mL = 0.500 L.
The molar concentration of sodium hydroxide is:
The concentration is an intensive property, that is, it does not depend on the amount of matter. As a consequence, the concentration of the 50 mL of solution in the buret is the same as the concentration in the flask.
Answer:
A. All the molecules or atoms in motion have kinetic energy.
B. All the molecules or atoms in motion have thermal energy.
C. Each molecule or atom in motion has thermal energy.
D. Each molecule or atom in motion has kinetic energy.
Explanation:
<u> </u><u>Increasing </u><u>pH will increase the </u><u>solubility </u><u>of the</u><u> CuBr.</u>
What is the solubility of water?
- When a solute is dissolved in a solvent to give a homogeneous mixture, one has a solution.
- Solubility is generally expressed as the number of grams of solute in one liter of saturated solution.
- For example, solubility in water might be reported as 12 g/L at 25 oC.
2CuBr + 2OH- ---> Cu2O(s) + 2HBr(aq)
adding OH- to the CuBr also shifts the equilibrium to the right side therefore increasing pH will increase the solubility of the CuBr.
Learn more about solubility
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