Select the statements that describe a method which can be used to make a buffer. partially neutralize a strong base solution by addition of a strong acid. add appropriate quantities of weak acid and its conjugate base to water. partially neutralize a weak base solution by addition of a strong acid. partially neutralize a strong acid solution by addition of a strong base. partially neutralize a weak acid solution by addition of a strong base.

Describe in detail the melting point behavior of the 80: 20 benzoic acid-mandelic acid mixture

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.

Mary is conducting an experiment on how pollution affects plant growth. how can she ensure that her data are reliable?