1. When a solution is diluted, does the following increase, decrease, or remain
ID: 1042165 • Letter: 1
Question
1. When a solution is diluted, does the following increase, decrease, or remain unchanged? a. The mass of solute b. The moles of solute c. The volume of solution d. The concentration of solution If you poured 10.00 mL of 1.30 M HCI into a 50.00-mL volumetric flask and diluted it to the mark, what would the final volume and final concentration of the solution be? 2. Questions 3 and 4 are about the procedure of preparing the standard solutions used in this experiment. The standard solutions will be provided directly in the lab. However, their concentrations will not be labelled on the reagent bottles. You have to calculate the concentrations of Fe" in each standard solution in ugdl based on the given information below: 3. 0.1756 g of (NH)Fe(SO) 6H O was dissolved in water and diluted to 250.00mL. The solution was labelled as Original Fe Stock Solution. The molar mass of (NH) Fe(SO):-6H:O is 392.15 gmol. Fe forms when (NH) Fe(SO)2-6H:O is dissolved in water: (NH4):Fe(SOJ26H:0(aq)--2NH4+(aq) + Fe2.(ag) + 2S042-(aq) + 6H00 a. Calculate the moles of (NH) Fe(SO):6H 0 used b. Calculate the moles of Fe+ in the stock solution. c. Calculate the mass of Fe in the stock solution in unit of g d. Calculate the concentration of Fe in the stock solution in units of g/L e. Calculate the concentration of Fe2+ in the stock solution in units of ?g/dL. 4. 10.00 ml of the Original Fe Solution was pipetted into a 100.00-mL volumetric flask and diluted to the mark. This diluted stock solution is labelled as Intermediate Fe Stock Solution a. Calculate the concentration of the Intermediate Fe" solution (in ?gdL). (HINT Remember the dilution formula CV CVThe concentrations. C and C can be in any concentration units you like just as long as they are the same for each. They don't have to be moles per liter. Likewise, the volumes, V, and V: can he in any volume units you like as long as they are the same for each)Explanation / Answer
Answer:
1)
a) & b) The solution is prepared by adding a solute to a solvent. When we say that diluted the solution it means we have increased volume (& mass ofcourse) of the solvent by keeping the mass of solute unchanged.
Thus dilution does not change Mass or Moles of solute.
c) The volume of the solution is the sum total of the volume solute and volume of the solvent. In dilution as the volume of soolvent increases, volume of solution will also Increases.
On dilution volume of the solution Increases.
d) Concentration o the solution is given as the # of moles of solute per L of the solvent.
Concentration = # of moles / Volume of the solvent.
In dilution Mass or moles of solute remains constant and volume of Solvent increases. (i.e. above fraction, Numerator remains same but Denominator value increases on dilution and henceFrction value decreases.
On dilution concentration of solution decreases.
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.