Suppose a student needs to determine the concentration of a NaOH solution. He performed a standardization titration using the primary standard, benzoic acid. mass of NaOH (g) 1.550 volume of NaOH solution (mL) 250.0 mass of benzoic acid (g) 0.705 volume of benzoic acid solution (mL) 100.0 volume of NaOH dispensed (mL) 40.12 What is the expected concentration of the solution? The molar mass of sodium hydroxide is 39.997 g/mol. and the molar mass of benzoic acid is 122.12 g/mol. 0.1431 expected concentration of NaOH: Incorrect What is the actual concentration of the NaOH solution based on the experimental results? actual concentration of NaOH: 0.1438 M M

Suppose a student needs to determine the concentration of a NaOH solution. He performed a standardization titration using the primary standard, benzoic acid. mass of NaOH (g) 1.550 volume of NaOH solution (mL) 250.0 mass of benzoic acid (g) 0.705 volume of benzoic acid solution (mL) 100.0 volume of NaOH dispensed (mL) 40.12 What is the expected concentration of the solution? The molar mass of sodium hydroxide is 39.997 g/mol. and the molar mass of benzoic acid is 122.12 g/mol. 0.1431 expected concentration of NaOH: Incorrect What is the actual concentration of the NaOH solution based on the experimental results? actual concentration of NaOH: 0.1438 M M

Introductory Chemistry: An Active Learning Approach

6th Edition

ISBN:9781305079250

Author:Mark S. Cracolice, Ed Peters

Publisher:Mark S. Cracolice, Ed Peters

Chapter16: Solutions

Section: Chapter Questions

Problem 100E: Potassium hydrogen phthalate is a solid, monoprotic acid frequently used in the laboratory as a...

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Potassium hydrogen phthalate is a solid, monoprotic acid frequently used in the laboratory as a primary standard. It has the formula KHC8H4O4. This is often written in the short-hand notation as KHP. If 25.0mL of a potassium hydroxide solution are needed to neutralize 2.26g of KHP, what is the molarity of the potassium hydroxide solution? Potassium hydrogen phthalate sometimes called potassium biphthalate, as shown on this bottle is an acid that is convenient to store and use because it is a solid.
95. Many metal ions form insoluble sulfide compounds when a solution of the metal ion is treated with hydrogen sulfide gas. For example, nickel(II) precipitates nearly quantitatively as NiS when H2S gas is bubbled through a nickel ion solution. How many milliliters of gaseous H2S at STP are needed to precipitate all (he nickel ion present in 10. mL of 0.050 M NiCl2 solution?
Tris(pentatluorophenyl)borane, commonly known by its aeronym BARF, is frequently used to initiate polymerization of ethylene or propylene in the presence of a catalytic transition metal compound. It is composed solely of C, F, and B; it is 42.23% C and 55.66% F by mass. a. What is the empirical formula of BARF? b. A 2.251-g sample of BARF dissolved in 347.0 mL of solution produces a 0.01267-M solution. What is the molecular formula of BARF?
. Why does the amount of excess solid solute present in a solution not affect the amount of solute that ultimately dissolves in a given amount of solvent?
Addition of water to concentrated sulfuric acid is dangerous because it generates enough heat to boil the water, causing it to spatter out of the container. For this reason, chemists remember to add acid to water. In a dilution experiment, we calculate the amount of the more concentrated solution that must be measured out. If we place this concentrated solution (Figure 4.7) in the volumetric flask first, then dilute with water, we violate the caution Add acid to water. Describe a safer variation on the method shown in Figure 4.7 that allows the quantitative dilution of concentrated sulfuric acid. Figure 4.7 Preparing a dilute solution from a concentrated solution. (a) Draw the concentrated solution into a pipet to a level just above the calibration mark. (b) Allow the liquid to settle down to the calibration line. Touch the tip of the pipet to the side of the container to remove any extra liquid. (c) Transfer this solution to a volumetric flask. Again touch the pipet to the wall of the flask to ensure complete transfer, but do not blow out the pipet because it is calibrated for a small amount of liquid to remain in the tip. (d) Dilute to the mark with solvent. Frequently, especially with concentrated acids, it is best to have some solvent present in the volumetric flask before you add the concentrated sample.
. Which of the following will affect the total amount of solute that can dissolve in a given amount of solvent? a. The solution is stirred. b. The solute is ground to line particles before dissolving. c. The temperature changes.