Calelate the pt of buffer thet is moude b mising 65 ml f .20 M NAHCo,...

Question

Question

science chemistry

Answer 1

Answer #1

PKa of HCO3^- is 10.33

no of moles of NaHCO3 = molarity * volume in L

= 0.2*0.065 = 0.013 moles

no of moles of Na2Co3 = molarity * volume in L

= 0.16*0.075 = 0.012 moles

PH = PKa + log[Na2CO3]/[NaHCo3]

= 10.33 + log0.012/0.013

= 10.33-0.03476

= 10.3 >>>>>answer

Answer 2

Similar Homework Help Questions

5. A buffer is made up of 355 ml each of 0.200 M NaHCO, and 0.134...

5. A buffer is made up of 355 ml each of 0.200 M NaHCO, and 0.134 M Na,CO3. Assuming that volumes are additive and the k, = 4.7 x10-1 calculate: a) the pH of the buffer b) the pH of the buffer after the addition of 0.0300 moles of HCI to 0.710 liters of buffer. c) the pH of the buffer after the addition of 0.300 moles of KOH to 0.710 liters of buffer.
A buffer solution is made up of 100 mL 1.0696 M acetic acid, and 100 mL...

A buffer solution is made up of 100 mL 1.0696 M acetic acid, and 100 mL 1.0410 M sodium acetate. A) Calculate the pH of 75 mL of the buffer solution after the addition of 1 mL of 3 M HCl. B) Calculate the pH of 75 mL of the buffer solution after the addition of 10 mL of 3M HCl.
f) (6 pts) Which of the following mixtures will make a buffer? (Circle only one!) r? Circle onlyone f)(6 1000 mL fh following mix oc m will make a b S a) 100 mL of 1.0 M HCI +100 mL of 1.0 M N...

f) (6 pts) Which of the following mixtures will make a buffer? (Circle only one!) r? Circle onlyone f)(6 1000 mL fh following mix oc m will make a b S a) 100 mL of 1.0 M HCI +100 mL of 1.0 M NaOH +100 mL of 0.50 M HF 100 mL of 1.0 M HCI c)100 mL of 1.0 M HF +100 mL of 0.50 M NaOH 100 mL of 1.0 M HF +100 mL of 1.0 M NaOH...

please help me answer this des ates are read DATA TABLE Buffer A Volume of buffer...

please help me answer this des ates are read DATA TABLE Buffer A Volume of buffer prepared (mL) Buffer B 100.0 mL 100.0 mL Molar concentration of HC,H,Oz in buffer (M) 0.1 M 1.0 M Initial pH of buffer 4.05 4.08 Volume of 0.5 M NaOH to raise pH by 2 units 1.54 mi 9.68 ml Volume of 0.5 M HCI to lower pH by 2 units (ML) 3.4 mL 5.5 mi DATA ANALYSIS 1. Write reaction equations to explain...
You are given 75 mL of 0.70 M acetic acid/acetate buffer to test. The starting composition...

You are given 75 mL of 0.70 M acetic acid/acetate buffer to test. The starting composition of the two major species are: Concentration of CH,COOH: 0.250 M Concentration of CH,COO: 0.450 M a. Calculate the initial pH of the buffer. Clearly show all work required to arrive at your answer. b. You add 1.0 mL of 2.00 M HCl to the buffer. Calculate the molarity of H, O' added as HCl, and the final molarities of acetic acid and acetate...
6. b) A student mixes 8.203 g of NaC,H,O, with 100 mL of 1.0 M HC,H,O2,...

6. b) A student mixes 8.203 g of NaC,H,O, with 100 mL of 1.0 M HC,H,O2, what is the pH of the buffer? (4 pts) Wall Co, Hº 3) NaHCO₃ H2O H₂CO NOCH ka 2.22x /у- PO4-р 2.22x 100 = [071%.1 [ot] =4,7x10-S 14 Potter pOH = -log[ott 14-4.32-1 OH = 4,32 (pH=9.631 222 x 10 8 b) If you add 5.0 mL of 0.5 M NaOH solution to 20.0 ml to the buffer above, what is the pH of...

Would the following solutions provide an effective buffer. a) 250. mL of 0.15 M HC2H3O2 +...

Would the following solutions provide an effective buffer. a) 250. mL of 0.15 M HC2H3O2 + 25 mL of 0.10 M NaOH yes no b) 125 mL of 0.50 M HNO2 + 75 mL of 0.40 M KNO2 yes no c) 250. mL of 0.25 M HCO2H + 125 mL of 0.50 M KOH yes no d) 250. mL of 0.50 M HClO4 + 150. mL of 0.50 M NaClO4 yes no e) 250. mL of 0.50 NaOH + 500....
20. A scientist adds 200 mL of 2.0 M NaOH to a 1.0 L buffer consisting...

20. A scientist adds 200 mL of 2.0 M NaOH to a 1.0 L buffer consisting of 1.0 M HClO2 and 1.20 M NaClO2. What is the pH of the resultant solution at 25'C? (K, of HClO2 = 1.1 x 10-2) A. 2.0 B. 1.2 C. 3.5 D. 2.4 E. 1.4
3. What pH would be obtained by adding 5 mL of 0.100 M NaOH to 20 mL of a 0.100 M NH3/NH Cl buffer LE with a pH of...

3. What pH would be obtained by adding 5 mL of 0.100 M NaOH to 20 mL of a 0.100 M NH3/NH Cl buffer LE with a pH of 9.26? Leg Ty 9.99

What mass of KF must be added to 200 mL of 0.15 M HF to obtain a buffer with pH = 3.00? Xg Enter a number. a)What is th...

What mass of KF must be added to 200 mL of 0.15 M HF to obtain a buffer with pH = 3.00? Xg Enter a number. a)What is the pH of a buffer made by mixing 75 mL of 0.1 M hydrocyanic acid (HCN) with 100 mL of 0.1 M NaCN at 25 °C? 9.43 b) What is the new pH if 2 mL of 1.0 M NaOH is added to the solution in part a? X How many grams...