1. Bath salts are typically composed of the ingredients listed below. Identify each item as being acidic, basic, or neutral when dissolved in water. If a particular ingredient does make an acidic or basic solution, describe how this occurs. Use the results of your in-lab observations, as well as your textbook and the provided Supplemental Information on pages 65-66, to support your conclusions. NaCl NaHCO3 sodium citrate Na2SO4 MgHPO4 CaCl2 NaCl is neutral in water, as in hydrolysis reaction with water it dissociates to form strong acid and strong base. NaCl + H2O HCl + NaOH Na2SO4 is also neutral. Na2SO4 + 2 H2O H2SO4 + 2 NaOH Sodium citrate is salt of weak acid and strong base. Hence its aqueous solurion is basic. aqueous solution of NaHCO3 is basic. In water the bicarbonate ion hydrolyzed to form OH - ion. HCO3- + H2O H2CO3 + OH- K3PO4 is a salt of weak acid and strong base, hence its water solution is basic. CaCl2 is a salt of strong acid and strong base, hence its water solution will be neutral.

Imagine that you have produced several versions of lactase, each of which differs from normal lactase by a single amino acid. describe a test that could indirectly determine which of the versions significantly alters the three-dimensional shape of the lactase protein.

13. calculate the initial concentration (before precipitation) of carbonate ions after the addition of each 0.05 ml of solution b to the 1.00 l beaker of solution a. divide the work among group members and write the answers in the table in model 3. assume the volume change as solution b is added is negligible. 14. notice the initial concentrations of zn2+ - and cu2+ in the table in model 3. a. explain how these were obtained from the data in model 2. b. as solution b is added and precipitates form, do these initial concentrations change? 15. use the data in model 2 to indicate the presence of precipitate (either znco3 or cuco3) after each 0.05 ml addition of solution b in model 3. 16. use the initial concentrations of carbonate ions and zinc ions to calculate the reaction quotient, qsp for the zinc carbonate scenarios in model 3. divide the work among group members and write the answers in the table in model 3. 17. use the initial concentrations of carbonate ion and copper(ii) ions to calculate the qsp for the copper(ii) carbonate scenarios in model 3. divide the work among group members and write the answers in the table in model 3.

What type of reaction is shown below? check all that apply. 2h2o2 → 2h2o + o2 synthesis decomposition combustion