Chem 121 Lab Final Practice Quiz

5. If the label on the bottle lists the citric acid content as 1 g per serving with a serving size of 240 mL determine the percent error in the titration results. Express result with 2 significant figures.

The following volumes of 0.000300 M SCN- are diluted to 15.00 mL. Determine the concentration of SCN- in each sample after dilution. These values will be used during the experiment.  Sample 0.000300 M SCN- (mL) [SCN-] (M) 1  1.50   2 3.50   3 7.00   4 10.00

Eight hydrochloric acid solutions were titrated and the concentration was determined to be as listed below. Calculate the average concentration in mM and report your answer with three places after the decimal. [hydrochloric acid] (M) 0.00873 0.01090 0.01567 0.01031 0.00860 0.01456 0.00916 0.01379

Can someone pls help thx

You have a solution of a standardized titrant of 0.01254 M and a sample that approximately has a molarity of 0.48 M. What dilution do you have to do to spend approximately 15 mL of titrant if you have 25 mL and 10 mL pipettes to take the diluted sample and value it ? Solution: With the 10 mL pipette, the sample should only be previously diluted 1:25, with the 25 mL one 1:64. Therefore, 10 mL of the sample can be taken and made up to 250 mL.

Don

The purity of KHP was determined by first weighing KHP using weighing by difference. and the weighed sample was titrated with NaOH solution. Calculate the % purity of the KHP sample given the following data. Express your answer in 2 decimal places. No need to include the unit.   I need anwer asap please show solution this is analytical chemistry

1

Fill in the blanks. Calculate the Average molarity (M) of Acetic acid in vinegar, using the following data. Calculate the mass percent of acetic acid in vinegar, using your average Acetic acid concentration (M) from the above result. Table 2. Data for titration of 20.00 mL of vinegar with approximately 1.2 M NaOH.

A student performed titration to find the concentration of acetic acid. Titrant was sodium hydroxide. He went beyond the indicator color change by adding too much titrant. How will his experimental error affect the calculated value for the concentration of unknown acetic acid? calculated value actual value. calculated value < actual value calculated value = actual value. more information is necessary this is not a source of error

CONCENTRATION DETERMINATION Buret contains NaOH solution *Sodium hydroxide solution: To 1 part reagent grade NaOH add 1 part distilled, carbon dioxide-free water by weight Erlenmeyer flask contains about 9ml of the acid and about 10 ml of distilled water made recently free from CO2 by boiling. DATA SHEET II Final Reading HCI Initial Reading HCI 9.4 Final Reading NaOH Initial Reading NaOH 10.65 10.55 1 ml HCI 1 mL NAOH mL NAOH mL NaOH mL HCL mL HCL Mean Values: 1 ml HCI = 1 mL NaOH = _mL NaOH mL HCL COMPUTATION:

Two 24.91 ml samples of apple juice were analyzed using 0.1000 M NAOH solution by the method in this experiment. The corrected mean titration volume of the NaOH solution was 15.87 mL. Calculate the malic acid concentration of the apple juice in units of g/L. Assume that only malic acid is present in the juice. State the value to 2 places after the decimal point, Do not enter units.

A chemist needs to determine the concentration of a sulfuric acid solution by titration with a standard sodium hydroxide solution. He has a 0.1886 M0.1886 M standard sodium hydroxide solution. He takes a 25.00 mL25.00 mL sample of the original acid solution and dilutes it to 250.0 mL.250.0 mL. Then, he takes a 10.00 mL10.00 mL sample of the dilute acid solution and titrates it with the standard solution. The endpoint was reached after the addition of 12.42 mL12.42 mL of the standard solution. What is the concentration of the original sulfuric acid solution?

Q 1 please I need help

A 15.5 mL sample of 0.215 M KOH was titrated with a weak acid. It required 21.2 mL of the acid to reach the equivalence point. The molarity of the acid is    Type the numerical answer only. Be sure to round to the proper number of significant figures!

I need some help please please please

Volumetric Analysis Liza carefully pipets 25.0 mL of 0.525 M NaOH into a test tube. She places the test tube into a small beaker to keep it from spilling and then pipets 75.0 mL of 0.355 M HCl into another test tube. When Liza reaches to put this test tube of acid into the beaker along with test tube of base, she accidentally knocks the test tubes together hard enough to break them and their respective contents combine in the bottom of the beaker. Is the solution formed from the contents of the two test tubes acidic or basic? What is the pH of the resulting solution?

18.9 milliliters of a 1.687 M KOH solution are required to titrate 30.1 milliliters of a H3PO4 solution. What is the molarity of the H3PO4 solution? ЗКОН + HзРОД --> K3PO4 + 3H2O Please put answer in box with 3 digits past decimal in regular non scientific notation.