Be sure to answer all parts. What is the [H3O+] and the pH of a benzoic acid-benzoate buffer that consists of 0.16 M C6H5COOH and 0.46 M C6H5COONa? (Ka of benzoic acid = 6.3 × 10−5) Be sure to report your answer to the correct number of significant figures. [H3O+] = _____ pH = ______

A chemist titrates 110.0 mL of a 0.3453 M methylamine (CH3NH₂) solution with 0.7011 MHCl solution at 25 °C. Calculate the pH at equivalence. The pK, of methylamine is 3.36. Round your answer to 2 decimal places. Note for advanced students: you may assume the total volume of the solution equals the initial volume plus the volume of HCl solution added. pH = X S ?

8. You will perform some calculations to see the difference between a pH buffer solution and a weak acid solution of the same pH when a small amount of strong base is added. Chlorous acid, HC1O₂, is a moderately strong acid with a Ka = 1.110×10-². Please answer the following questions. A. B. What is the molarity of the HClO₂ solution whose pH is 2.21? Please provider your answer below. 미ㄷ → Please provider your answer below. f A $ To prepare a buffer solution of the same pH, what is the molarity of the NaClO₂ if the molarity of the HC1O₂ is 0.6771 M? M → M → $

Describe how you would prepare a 250.0 mL buffer solution that has a pH of 7.40 and has a H2PO4 − concentration of 1.0 M. You only have the following materials available. Materials/Chemicals: 1 L jug of deionized water 250.0 mL volumetric flask 500 mL bottle of 1.0 M H3PO4 500 g bottle of NaH2PO4 500 g bottle of Na2HPO4 500 g bottle of Na3PO4 500 g bottle of HF

What mass (in grams) of sodium acetate (CHCOONa) must be added to 100.00 mL of a 0.115 M solution of acetic acid in order to prepare a buffer solution with a pH of 4.70? The K, of acetic acid is 1.8 x 10-5. Mass of sodium acetate = g ences Mc Graw Hill JUN 27 MacBook Air 000 F1 F2 F3 F4 F5 F6 F7 F8 F9 $ % & 2 4 6. 7 Q W R. Y U < (O 法 # 3

Ka of acetic acid equals 1.8*10^-5 The buffer solution is 50 mL of 0.2 M CH3CO2H and 50 mL of 0.2 M NaCH3CO2together in a beaker.  What is the theoretical pH of each soluton? a. 50 mL of boiled deionized water + 5 mL of 0.2 M HClb. 50 mL of boiled deionized water + 5 mL of 0.2 M NaOHc. 50 mL of buffer + 5 mL of 0.2 M HCld. 50 mL of buffer + 5 mL of 0.2 M NaOH

9 Please!

A solution contains 0.312 M HA (K₂ = 2.20-10-7) and 0.680 M NaA. What is the pH of this solution? What is the pH of this solution after 0.212 mol of HCI are added to 1.00 L of this solution? What is the pH of this solution after 0.424 mol of HCI are added to 1.00 L of this solution? Question Help: Video Submit Question [11

What is the pH of the resulting solution when 2.11 x 10-3 moles of KOH is added to 0.100 L of a bu"er solution that is 0.100 M in HC2H3O2 and 0.100 M NaC2H3O2? Given: Ka for acetic acid is 1.81x 10-5 at 25 °C. Correct Answer: 4.93     ( please type answer note write by hend )

9.7 What is the de Broglie wavelength of an oxygen molecule at room temperature? Compare this to the average distance