(3 pts) 6) A solution is prepared by mixing 0.45 mL of 5.0 x 10ⓇM proflavin,...

Question

Question

Answer 1

Answer #1

Number of moles of proflavin present in the mixture

=Molarity x Volume (L)

=5.0 x 10^-6 M x 0.45 mL/1000 mL/L (1 L=1000 mL)

=2.25 x 10^-9 mol

Total volume of solution=0.45 mL + 0.45 mL=0.90 mL

=0.90 mL/1000 mL/L=0.90 x 10^-3 L

Concentration of Proflavin in the mixture

=number of moles/volume of solution (L)

=2.25 x 10^-9 mol/0.90 x 10^-3 L=2.5 x 10^-6 M

So the answer is 2.5 x 10^-6 M

Answer 2

Similar Homework Help Questions

A buffer is prepared by mixing 113 mL of a 0.120 M solution of the weak...

A buffer is prepared by mixing 113 mL of a 0.120 M solution of the weak acid HA with 130 mL of a 0.150 M solution of NaA. What will be the pH of the resulting solution? Ka for HA is 2.30x10-6. ** All volumes should have 3 significant figures.
A buffer is prepared by mixing 115 mL of a 0.120 M solution of the weak...

A buffer is prepared by mixing 115 mL of a 0.120 M solution of the weak acid HA with 115 mL of a 0.150 M solution of NaA. What will be the pH of the resulting solution? Ka for HA is 2.30x10-6
1. A student makes a solution by mixing 7.0 mL of a 4.5 x 10 M...

1. A student makes a solution by mixing 7.0 mL of a 4.5 x 10 M solution of Allura Red and 3.0 ml of water. What is the concentration of Allura Red in the resulting solution? A student is interested in the concentration of blue dve in his favorite beverage. He knows that spectroscopy can be used to determine the concentration of dye molecules in a solution. After making several solutions of known concentration, the student measured the absorbance of...

What is the equilibrium concentration of CNlion in a solution prepared by mixing 30.0 mL of...

What is the equilibrium concentration of CNlion in a solution prepared by mixing 30.0 mL of 0.290 M HCN and 30.0 ml of 0.290 M NH 3? NH3 + HCN - CN1- + NH4+ K = 0.710 [CN1'] = .0152 X M
A buffer solution was prepared by mixing 540 mL of 0.431 M Naocl and 269 mL...

A buffer solution was prepared by mixing 540 mL of 0.431 M Naocl and 269 mL of 0.361 M HOCI. Calculate the pH of the buffer given that Ka (HOCI) is 3.2 x 10-8. Provide your answer to two places after the decimal. Your Answer: Answer
A solution is prepared by mixing 150 mL of a 0.180 M tris solution with 200...

A solution is prepared by mixing 150 mL of a 0.180 M tris solution with 200 mL of a 0.150 M Tris hydrochloride solution. The pKa for TrisH+ is 8.07. What is its pH (report to hundredth decimal place)? (5 pts) B. If 7.34 mL of 0.881 M NaOH is added, what is the pH after equilibration? (6 pts)

4. Calculate the pH of a buffer solution prepared by mixing 10.0 mL of a 0.50 M CH,CO;H and 10.0 mL of a 0.50 M CHC...

4. Calculate the pH of a buffer solution prepared by mixing 10.0 mL of a 0.50 M CH,CO;H and 10.0 mL of a 0.50 M CHCO Na. Record this pH in Part II data sheet, Beaker #1 & N2 for Theoretical Initial pH. K for CHCOH = 1.8 x 10 at 25°C. a. Calculate the pH of the buffer solution upon addition of 0.25 mL of a 6.0 M HCL Record in Part Il data sheet, for Theoretical Final pH...
A buffer solution is prepared by mixing the following solutions: SHOW WORK 50. mL of 2.0...

A buffer solution is prepared by mixing the following solutions: SHOW WORK 50. mL of 2.0 M weak acid (HA) solution and 50. mL of 2.0 M conjugate base solution (NaA) solution. The Ka for HA is 2.27 x 10-11. 41. What is the pH of the resulting solution after adding 100 ml of 1.0 M HCl to the original buffer solution? 11.12 b) 10.64 c) 12.32 d) 0.48 e) 5.32
What is the pH of a buffer solution prepared by mixing 30.0 mL of 0.10 M...

What is the pH of a buffer solution prepared by mixing 30.0 mL of 0.10 M of HOAC and 40.0 mL of a 0.1 M NaOAc Pka of the acid is 4.74

A buffer solution is prepared by mixing 78.0 mL of 0.279 M fluorobenzoic acid (C7H5O2F) with...

A buffer solution is prepared by mixing 78.0 mL of 0.279 M fluorobenzoic acid (C7H5O2F) with 50.0 mL of 0.476 M sodium fluorobenzoate. The pKa of this weak acid is 2.90. What is the pH of the buffer solution? (with correct sig figs)