Question 4 (1 point) If a 20 mL sample is diluted to 100 mL, the concentration...
You diluted a 12.96 ml vinegar sample into a 100 ml volumetric flask with distilled water. You titrated a 25.00 mL aliquot of that solution and determined the concentration of acetic acid to 0.048 M. What was the concentration of acetic in the original sample.
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...
a protein sample was diluted 1/5 and then 5ml of the diluted sample was mixed with 20 ml of reactants to give 25 ml total volume. from this 25 ml solution, 5ml were removed. this 5ml contain 3 mg of protein. what was the concentration of protein in the original sample
1) A stock solution has a concentration of 100 µg/mL. If 20 µL of stock is added to a beaker. What is the mass of the dye in µg? 2) If the absorbance of the same dye (after diluted with water to 3 mL) is 0.3 AU, what is A/µg of the dye used?
A 10.5 mL sample of HNO3 was diluted to a volume of 103.37 mL. Then, 23 mL of that diluted solution were needed to neutralize 53.9 mL of 0.74 M KOH. What was the concentration of the original nitric acid?
Place the events occurring during the Dilution in Analysis experiment into correct order some diluted acid is transferred to a clean, dry beaker the diluted acid samples are titrated to a phenolphthalein endpoint using NaOH solution the concentration of the original stock acid is calculated the 100 mL volumetric flask containing 20 mL of stock acid is filled to the mark stepwise with swirling the 100 mL volumetric flask is stoppered and inverted with swirling multiple times the concentration of...
• Another student diluted her acetic acid sample with 10 ml of water before titrating with NaOH. Does this change the concentration of the acetic acid sample? Explain. • Does this change the pk, determined from the graph? 3. Look at all of your titration curves. Starting at 1 mL past the neutralization point, what can you say about all four graphs? 4. Use your concentration of acetic acid in mol/L and a density of 0.9987 g/mL for the acetic...
Question 6 (1 point) In your pre-lab, you were asked to determine the concentration for a 25.00 mL sample of acetic acid, CH3COOH (K= 1.8 x 10-5) of unknown concentration. Suppose you now repeat that same titration, using another 25.00 mL sample of that same unknown acetic acid and the same concentration of NaOH as a titrant. However, before you start titrating, you add an additional 100 mL of water to the flask containing our sample of acid. Everything else...
ncetoi paper) 1. BSA stock solution A has a concentration of 3.50 mg/mL. 1.00 mL of stock solution A is diluted to a final volume of 5.00 mL to prepare solution B. 1.00 mL of solution B is diluted to a final volume of 5.00 mL to prepare solution C. 1.00 mL of solution C is diluted to a final volume of 10.00 mL to prepare solution D. Calculate the concentrations of solutions E, C, and D. Show your work....
Plating 1.0 ml of a sample diluted to 10^-4 produced 57 colonies. What was the CFU/ml in the original sample? What would it be if you plated 0.1 ml with same colonies formed?