a. How many grams of NaCl would you need to weigh out to make up 150 ml of a solution? b. You will be preparing 300 ml of media. You need to dilute this 20% stock of NaCl, the 30% stock of K2HPO4, the 2.5 M NH4 how much stocks you need to add. Fill in the table below. Stock                 Calculate Final Concentration needed      ml added 20% NaCl                            1.5%                                            ? 30% K2HPO4                         2%                                            ? 2.5 M NH4 Cl                        0.1M                                          ? 10 mg/ml ampicillin water    0.05 mg/ml                               ?        water                                      To 300 ml                                 ?

Chemistry: The Molecular Science
5th Edition
ISBN:9781285199047
Author:John W. Moore, Conrad L. Stanitski
Publisher:John W. Moore, Conrad L. Stanitski
Chapter3: Chemical Reactions
Section: Chapter Questions
Problem 87QRT: You need 300. mL of 0.500-M K2Cr2O7. Which method is best to prepare this solution? Explain your...
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You have a 20% stock of NaCl, a 30% stock of K2HPO4, 2.5 M NH4Cl and 10 mg/ml stock of ampicillin.

a. How many grams of NaCl would you need to weigh out to make up 150 ml of a solution?
b. You will be preparing 300 ml of media. You need to dilute this 20% stock of NaCl, the 30% stock of K2HPO4, the 2.5 M NH4 how much stocks you need to add. Fill in the table below.

Stock                 Calculate Final Concentration needed      ml added
20% NaCl                            1.5%                                            ?

30% K2HPO4                         2%                                            ?

2.5 M NH4 Cl                        0.1M                                          ?

10 mg/ml ampicillin water    0.05 mg/ml                               ?       

water                                      To 300 ml                                 ?

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