A biochemist carefully measures the molarity of salt in  33.mL  of photobacterium cell growth medium to be  54.   mM .   Unfortunately, a careless graduate student forgets to cover the container of growth medium and a substantial amount of the solvent evaporates. The volume of the cell growth medium falls to  9.1mL . Calculate the new molarity of salt in the photobacterium cell growth medium. Round each of your answers to  2

An impure sample contains 1.01 g of impurities and 4.92 g of benzoic acid.  The impure sample is dissolved in water, then heated.  The solution is then cooled.  How many grams of benzoic acid will recrystallize when the solution has cooled? Include the unit and two decimal places in your answer. The solubilities of the impurity and benzoic acid in hot water are found as an item in the Recrystallization Experiment folder.   Solubility Data for Report Questions 10  Compound Cold Water solubility Hot Water Solubility Benzoic acid 0.42 g per 100 mL of water 5.79 g per 100 mL of water Impurity 0.61 g per 100 mL of water 4.62 g per 100 mL of water

A chemist adds 455.0 ml. of a 3.4M silver nitrate (AgNO, solution to a reaction flask. Calculate the millimoles of silver nitrate the chemist has added to the flask. Round your answer to 2 significant digits. Immol

2. To save on production costs, most automobile bumpers are never coated with more than 200 g of chromium. In order to plate 200 g of chromium, calculate the length of time for which a standard bumper should be immersed in a chromium vat. [1.48 x 10³ s] 1 Answer:

A 0.100 M solution of an unknown acid, HA, is 3.95% ionized. Complete the following table, but instead of using the variable x, calculate the number values of each quantity and report these values to the correct number of significant figures. Fill in all of the cells. Include signs in the Change column to indicate a gain or loss of concentration. Do not include any units in your answers, M is assumed. To enter values in scientific notation follow the convention: 0.00753 = 7.53E-3 Submit Answer Tries 0/45 What is the Ka of HA? Calculate your answer to three sig figs. K₂= Submit Answer Tries 0/45 Now calculate the pH of the solution of HA. pH= Initial Change Equilibrium [HA] [H+] [A]

When a Vitamin C (ascorbic acid; MM = 176.12 g mol-1) tablet is crushed, dissolved and titrated with 0.0377  M KIO3(aq) to a purple/blue endpoint (given by a starch indicator), the volume of KIO3 used is 40.01 mL.  How many mg of Vitamin C were in the tablet? KIO3(aq) + 5 KI + 6 H+ → 3 I2(aq) + 3 H2O I2 (aq) + ascorbic acid → 2 I- + dehydroascorbic acid

A biochemist carefully measures the molarity of glycerol in 84.0 mL of photobacterium cell growth medium to be 38.2 µM. Unfortunately, a careless graduate student forgets to cover the container of growth medium and a substantial amount of the solvent evaporates. The volume of the cell growth medium falls to 9.21 mL. Calculate the new molarity of glycerol in the photobacterium cell growth medium. Round each of your answers to 3 significant digits. do x10 Continue Submit Assignment O 2021 McGraw Hill LLC. All Rights Reserved. Terms of Use Privacy Center Accessibility MacBook Air DII DD 000 F10 F11 F12 esc F8 F9 F4 F5 F6 F7 F1 F2 F3 @ $4 6 7. 8. %23

Molarity

Question 4. You are on a field trip with your professor and he asks you to make a fixative solution to collect and preserve specimen. You are told to prepare 200 mL of fixative solution containing 30% formaldehyde (vol/vol), 1X glycerol and 2.5 mM sodium chloride (NaCI). In the field trip van you find a stock of 100% pure formaldehyde (liquid), a 10X glycerol stock (liquid), plenty of water and a stock solution of 5M NaCl. There are also all kinds of pipets, cylinders and beakers to measure volumes. 1. a) provide calculations and describe the process of making the fixative solution?

You are given a concentrated stock solution of 3.0 M sucrose, and you’re asked to do a serial dilution of 1:25, 1:10, and 1:5. What is the final concentration of sucrose (in mM) you achieve after these dilutions. Show your unit conversions step by step