To maximize the yield in a certain manufacturing process, a solution of a weak monoprotic acid that has a concentration between
0.20 M and 0.30 M is required. Four 100. mL samples of the acid at different concentrations are each titratedwith a 0.20 M NaOH solution. The volume of NaOH needed to reach the end point for each sample is given in the table. Which solution is the most suitable to maximize the yield? Extra Content
Acid Solution Volume of NaOH added (mL)
A 40 mL
B 75 mL
C 115 mL
D 200 mL
A. Solution A
B. Solution B
C. Solution C
If you have a solution of a monoprotic acid, it means that it has the form HA (just one Hydrigen atom). Therefore, one molecule of acid is going to react with just one molecule of NaOH.
So, if you have a solution of 100 ml of 0,2 HA acid, it is going to react with a 100 ml of 0,2 M NaOH solution. Beacause we know that the acid can be a little more concentrated than 0,2 M (0,2-0,3), it probably needs a little more than 100 ml of NaOH to react. So, the answer is C.
in 100 ml of 0,2M acid you can find 0,002 mol of HA
in 100 ml of 0,3 M acid you can find 0,003 mol of HA
in 100 ml of 0,2 M NaOH you can find 0,002 mol of NaOH
the answer can not be 200 because in 200 ml of 0,2 M NaOH there are 0,004 mol of NaOH, which is more than 0,003 mol.
If a dynamic equilibrium is disturbed by changing the conditions, the position of equilibrium shifts to counteract the change to reestablish equilibrium. If a chemical reaction is at equilibrium and experiences a change in pressure, temperature, or concentration of products or reactants, the equilibrium shifts in the opposite direction to offset the change. This page covers changes to the position of equilibrium due to such changes and discusses briefly why catalysts have no effect on the equilibrium position.
For example, if the system is changed in a way that increases the concentration of one of the reacting species, it must favor the reaction in which that species is consumed. In other words, if there is an increase in products, the reaction quotient, Qc, is increased, making it greater than the equilibrium constant, Kc.
8025.996 grams are there in 3.26*10²⁵ Molecules of Mg(NO₃)₂.
Avogadro's Number or Avogadro's Constant is called the number of particles that make up a substance (usually atoms or molecules) and that can be found in the amount of one mole of said substance. Its value is 6.023*10²³ particles per mole. Avogadro's number represents a quantity without an associated physical dimension, so it is considered a pure number that allows describing a physical characteristic without an explicit dimension or unit of expression. Avogadro's number applies to any substance.
Then you can apply the following rule of three: if 6.023*10²³ molecules are contained in 1 mole of the compound, 3.26*10²⁵ molecules are contained in how many moles of the compound?
amount of moles= 54.12
Molar mass is the mass of one mole of a substance, which can be an element or a compound. Being the molar mass of the compound Mg(NO₃)₂ 148.3 g/mole, so 54.12 moles of the compound contains 8025.996 grams.
<u><em>8025.996 grams are there in 3.26*10²⁵ Molecules of Mg(NO₃)₂.</em></u>