1) 7. 10.0 mL of 0.10 M HBr is mixed with 10.0 mL of 0.10 M HCOOH. What is the pH?
2) 15. Calculate the pH of a solution containing 2.5 x 10 –2 mol of nicotinic acid (a monoprotic acid dissolved in 350 mL of water. ( K a = 1.1 x 10 -5 )
3) A 1.0 L buffer solution is made up of 0.15M NaF and 0.20 M HF ( pK a = 3.17) . 0.05 mol of HCl is added to it. What is the new pH? ( Correct answer is 2.77)
a. What's the pH after 10.0 mL of 0.10 M HCl is added to a 1.0-L buffer solution composed of 0.050 M HC3H5O3 and 0.025 M NaC3H5O3 b. Where in the titration process is a 30.0 mL of 0.10 M selenous acid, H2SeO3 with the addition of 22.5 mL of 0.20 M NaOH?
A buffer is prepared by adding 45.0 mL of 0.15 M NaF to 35.0 mL of 0.10 M HF. What is the pH of the final solution? The Ka of hydrofluoric acid is 6.8 x 10-4.
29. E 2.- b. 125.0 mL of 0.10 M NH; WILT JUUM 16. Calculate the pH of the solution that results from each mixture. a. 150.0 mL of 0.25 M HF with 225.0 mL of 0.30 M NaF b. 175.0 mL of 0.10 M C H NH, with 275.0 mL of 0.20 M CH,NH4Cl 17. Calculate the ratio of NaF to HF required to create a buffer with pH = 4.00. IT YILC concentration
1x10ⓇM B 2x10 M 40 Normal gastric juice has a pH of about 2 and the gastric in is the concentration of HCl in the stomach? U10 M D 3x10 M of about 2 and the gastric juice is aqueous HCI. What 2 M HCI B 1.0x10' M HCI C 0.01 M HCI D 0.14 M HCI Ques. to, 41 Question What is the [H30'] of a sweat sample that has a pH = 5.8? A 2x10mm B3X10ⓇM 3x107M 42...
1. A buffer is prepared using 0.20 mol of H2PO4 and 0.10 mol of HPO42 in 500 mL of solution. Will the buffer capacity be exceeded if 5.6 g of KOH is added to it? What is the pH of the original solution and the pH of the new solution? (Kb 1.6 x 10-7) 2. How many milliliters of 0.113M HBr should be added to 52.2 ml of 0.0134 M morpholine to give a pH of 8? (The pKa of...
number 15 work and explanation please Options A and C are equalily optimal A. C. 14. Which of the following combinations will result in a buffer solution when dissolved in D. 100. mL of water? A. 0.20 mol HF and 0.10 mol NaOH B. 0.20 mol HBr and 0.10 mol NHs C 0.20 mol NaCI and 0.10 mol HCI D. None of these. 15. How many grams of Na2COs (molar mass 106 g/mol) must be added to 1.00 L of...
25.0 mL of 0.10 M formic acid (HCOOH, Ka = 1.8 x 10-4) is mixed with 20.0 mL of 0.10 M potassium hydroxide. What is the pH of the resulting solution? A. 2.37 B. 4.35 C. 13 D. 0.60
-e-laboratory Assignment Name: ead the experiment and answer the following questions as directed by your instructor A student is performing a titration. Diagrams of the buret at the beginning and the end of the titration are shown at right. To the correct number of significant figures, what is the initial volume, the final volume, and the volume of solution added during the titration? 16 2) Formic acid (HCOOH) is a weak acid with K. - 1.8 x 10-4. a) Write...
Estimating pH 1. If you combine 40.0 mL of a 0.80 M HF solution with 60.0 mL of a 0.60 M NaF solution, which of the following is correct? HF pKa = 3.17. a) pH will be > 3.17 b) pH will be < 3.17 c) pH will equal 3.17 2. If 1.50 mL of 1.0 M HNO3 is added to a solution containing 40.0 mL of 0.80 M HF and 60.0 mL of 0.60 M NaF, what will happen...
2. A 25.0 mL sample of 0.12 M HBr is mixed with 15.0 mL of 0.10 M KOH. Calculate the pH of the mixture. Assume the volumes are additive.