What part of the titration curve of a weak acid corresponds to the buffer region? Explain.2.Why is the end point of a titration of weak acidand potassium hydroxide somewhat basic?3. Consider 100 mL of 0.100M H3A. Assume that H3A is a Triprotic acid. Assume the H3A has pKa1= 4; pKa2 = 8; pKa3= 12You will titrate this acid with 0.100M NaOH. a) What volume of the NaOH must be added to maximize the concentration of H2A-?b) What volume of the NaOH must be added to maximize theconcentration of HA2-?c) What arethe pH of the solutionsin parts(a)and (b)?d) What is the pH of solution after only 30 mL of the NaOH have been added? What are the major species of H3A in this solution?e) What is the pH of the solution after 130 mL of NaOH have been added? What are the major species of H3A in this solution?f) What is the pH of the solution after 150 mL of NaOH have been added? What are the major species of H3A in this solution?g) What is the pH of the solution after 230 mL of NaOH have been added? What are the major species of H3A in this solution?h) What is the pH of the solution after 300 mL of NaOH have been added? What are the major species of H3A in this solution?

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.

Follow the steps provided in the simulation to add water to the graduated cylinder, select one of the three samples (copper, silver, or gold), set its mass to the values given in the statements below, and calculate its density. here is a summary of the steps required: add water by clicking and holding prepare a known volume of water button. until the desired volume of water has been added. if more than the desired volume is added, click the reset button. button and redo the procedure. a single click will add about 21.0 ml of water. to set the mass, click and hold weigh out metal button. until the desired amount of metal is added to the weighing pan. once the desired mass of the metal is added, release the button. transfer the metal to water and then click on calculate density button. to see how the density is calculated using water displacement to measure the volume of the solid. to save time you can approximate the initial volume of water to â±1 ml and the initial mass of the solid to â±1 g. for example, if you are asked to add 23 ml of water, add between 22 ml and 24 ml. which metals in each of the following sets will have equal density? check all that apply.

Define dew point. i am writing this part to be able to ask the question