Question 11 4 pts You want to prepare a certain concentration of salt solution from 50.0mL...
Attempt 1 Question 11 of 14 > You want to prepare a solution with a concentration of 200.0 PM from a stock solution with a concentration of 500.0 mM. At your disposal you have 5 mL and 10-ml transfer pipets and volumetric flasks of sizes 100, 250, 500, and 1000 mL. Which of the following serial dilutions will give you the 200.0 M solution? Produces a 200.0 M solution Does not produce a 200.0 M solution Dilute 10.00 mL of...
You want to prepare 50 mL of a 20% NaCl salt solution from a 100% stock. Calculate the amount of stock as well as the amount of water you need to use to make this dilution. Assume that you have unlimited volume of the stock.
Question 4: An alcohol solution is prepared by mixing 50.0mL (31.5g) of ethyl alcohol (CH3CH2OH) with 75.0mL (75.0g) of water a. Identify the solute and solvent. [0.5pt b. What is the mass of the solution (in grams)? [0.5pt] c. What is the volume of the solution (in mL)? [0.5pt] d. Calculate the mass/volume% of the solution. [lpt] e. Calculate the Molarity of the solution. [2pt] If you diluted 25mL of this solution to a volume of 100mL, what would the...
Question 1 20 pts Please prepare 20 mL of 0.2 M NaOH, given a stock solution of 0.6 M NaOH. State the precise amount of the 0.6 M NaOH used and the amount of diluent (H2O) added Question 2 20 pts Please prepare 500 mL of a 1/100 dilution of serum from a tube with a 1/10O dilution of serum. Please state the volume of the 1/10 dilution of serum used and the volume of diluents (H2O) used 20 pts...
D Question 44 4 pts 365 Molarity & solution concentration: Your answers need to have the correct number of significant figures To prepare 1.50 L of a 2.8 M solution using 650 mL of a stock solution, what concentration of stock solution would be required for this dilution?
Given a stock solution of yellow #5 with a concentration of 2.9 x 10-4 M, calculate the concentration of yellow #5 in the 4 prepared solutions (A thru D) assuming you perform these dilutions exactly as required in the procedure of this lab. 50 mL Beaker Dye stock solution 1:1 Ethanol/Water solvent A 1.00 mL 9.00 mL B 3.00 mL 7.00 mL C 5.00 mL 5.00 mL D 7.00 mL 3.00 mL
when you dilute a stock solution of 6.00m naoh aqueous to prepare a 0.100m naoh aqueous dilution. calculate the volume of the concentrated naoh aqueous solution needed to prepare 250.0 ml of the dilution
4 A 12.34 mL solution with an unknown salt concentration had a mass of 10.25 g. When the water was evaporated from the solution, 4.78 g of NaCI remained. a Calculate the mass-mass percent NaCi concentration in the solution. Show your work b Calculate the mass-volume percent NaCl concentration in the solution. Show your work. c Calculate the molarity of NaCI in the solution. Show your work.
1. Serial dilution Questions: a) (5 pts) Suppose you begin with stock solution of dye that has a concentration of 350.0 mg/L and do the following set of serial dilutions on it: 5.00 mL of stock diluted to a total volume (TV) of 500.00 mL (Dilution 1); 2.00 mL of Dilution 1 is then diluted to a TV of 250.00 mL (Dilution 2); finally, 1.00 mL of Dilution 2 is then diluted to a total volume of 100.00 mL. Calculate...
Name: Determination of Solution Concentration by Spectrophotometry PRELAB QUESTIONS 1. A student measures the absorbance of an unknown after placing a sample in a cuvette which contained some water. How will this affect the concentration he reports? 2. Explain why it is all right to leave water in the volumetric flask before you put in the 10.00 mL of your unknown. 3. A 1.3 x 10-M solution of an unknown substance has an absorbance of 0.345 at its max. a)...