Cengage Learning C OWLv2 | Online teaching and b Cengage Learning OWLv2 | O ☑ Inbox (4,532) - erica.e.2022@ X 11 Google Calendar - Week of Ap ✓ + prod03-cnow-owl.cengagenow.com/ilrn/takeAssignment/takeCovalentActivity.do?locator-assignment-take New Chrome available : Ch 17 Buffers and solubility 1. Buffers: Calculate pH, Acidic (100K ..2 pt 2. Buffers: Calculate pH (Henderson-...2 pt (M) 3. Buffer Preparation: Direct Additio... 2 pt 1 req Question Question Question 4. Titration Curve: Weak Acid/Strong ... 2 pt M M 5. Titration Curve: Interpret, Choose I... 2 pt (M) 6. Writing Ksp Expressions 2 pt 7. Ksp: Calculate from Solubility (g/L) 2 pt M 8. Common lon Effect: Calculate Solu...2 pt 9. Precipitation: Concentration Nee... 2 pt 1 req 10. Buffer + Acid/Base: Calculate pH ... 2 pt M Progress: 8/10 groups [Review Topics] [References] Use the References to access important values if needed for this question. How many grams of solid potassium nitrite should be added to 0.500 L of a 0.208 M nitrous acid solution to prepare a buffer with a pH of 4.066? (K₂ (HNO2) = 4.50 × 10-4) a Mass= g Submit Answer Retry Entire Group 2 more group attempts remaining Due Apr 12 at 11:00 PM Show Hint Finish Assignment Cengage Learning | Cengage Technical Support Previous Next Email Instructor Save and Exit

Cengage Learning C OWLv2 | Online teaching and b Cengage Learning OWLv2 | O ☑ Inbox (4,532) - erica.e.2022@ X 11 Google Calendar - Week of Ap ✓ + prod03-cnow-owl.cengagenow.com/ilrn/takeAssignment/takeCovalentActivity.do?locator-assignment-take New Chrome available : Ch 17 Buffers and solubility 1. Buffers: Calculate pH, Acidic (100K ..2 pt 2. Buffers: Calculate pH (Henderson-...2 pt (M) 3. Buffer Preparation: Direct Additio... 2 pt 1 req Question Question Question 4. Titration Curve: Weak Acid/Strong ... 2 pt M M 5. Titration Curve: Interpret, Choose I... 2 pt (M) 6. Writing Ksp Expressions 2 pt 7. Ksp: Calculate from Solubility (g/L) 2 pt M 8. Common lon Effect: Calculate Solu...2 pt 9. Precipitation: Concentration Nee... 2 pt 1 req 10. Buffer + Acid/Base: Calculate pH ... 2 pt M Progress: 8/10 groups [Review Topics] [References] Use the References to access important values if needed for this question. How many grams of solid potassium nitrite should be added to 0.500 L of a 0.208 M nitrous acid solution to prepare a buffer with a pH of 4.066? (K₂ (HNO2) = 4.50 × 10-4) a Mass= g Submit Answer Retry Entire Group 2 more group attempts remaining Due Apr 12 at 11:00 PM Show Hint Finish Assignment Cengage Learning | Cengage Technical Support Previous Next Email Instructor Save and Exit

Fundamentals Of Analytical Chemistry

9th Edition

ISBN:9781285640686

Author:Skoog

Publisher:Skoog

Chapter31: Introduction To Analytical Separations

Section: Chapter Questions

Problem 31.18QAP

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How much benzoic acid, Ka = 6.3⋅10-5, will remain undissociated in the aqueous phase of a 50 % oil-water emulsion if the initial concentration of benzoic acid in the aqueous phase is 0.5 %? The aqueous phase is buffered at pH 5. The true oil/water partition coefficient (for undissociated benzoic acid) is equal to 5.33. Assume that benzoic acid remains as a monomer in the oil phase.
Given the SEPs: Br2(l) + 2e- ↔ 2Br- E0 = 1.078 V Br2(aq) + 2e- ↔ 2Br- E0 = 1.098 V a. Calculate the Keq for the reaction: Br2(l) ↔ Br2(aq) b. Calculate the solubility of Br2 (159.808) in water at 250C. Express in g/L.
A 100 ml bottle of metronidazole 100 mg/ml suspension is available in your pharmacy. Calculate the volume of this suspension needed to be diluted with cherry syrup to prepare 60 ml of a 4% metronidazole suspension. 1 ml of a 1:1000 epinephrine injection was mixed with 20 ml of 1% lidocaine injection. Calculate the new ratio strength of epinephrine in the admixture. (IGNORE ANY VOLUME CHANGES AFTER ADMIXTURE) Instead of preparing 4 grams of tetracaine hydrochloride 4% gel an 8% gel was compounded by mistake. How many grams of the 8% gel and gel base must be mixed to get 4 grams of a 4% gel? How many milliliters of 70% ethanol and 20% ethanol must be mixed to prepare 500 ml of 30% ethanol? A diphenhydramine elixir contains 12.5 mg drug in one teaspoon. The volume of oral vehicle that is to be added to 100 ml of this elixir to reduce its strength by one half its original strength is; 6. 90 capsules of Liothyronine (T3) 15 micrograms are to be prepared. The formula calls for a 1:10000…
At 25oC the Ksp for PbCl2 is 1.6 × 10–5. Calculate Q for the following: 125.0 mL of 0.0100 M Pb(NO3)2 is mixed with 75.0 mL of 0.0200 M NaCl at 25oC
Calculate the solubility of lead(II) sulfate (Ksp = 2.53x10-8) in a 0.0034 M solution of sodium sulfate. Give your answer to three sig. figs. and in exponential form (e. g. 1.23E-3).
1. These are balances that have a maximum loading of 10 to 30 g with a precision of 60.01 mgA. semi-microanalyticalB. MicroanalyticalC. MacrobalancesD. Triple Beam Balance2. Which type of curve is normally produced when plotting the change in the concentration of a specie of some function and the amount of reagent added?A. Titration curveB. Sigmoidal CurveC. Phase Transition curveD. Calibration curve3. In the dead dear case study, silver diethyldithiocarbamateforms a colored solution when it binds with arsenic, what do we call substance like silver diethyldithiocarbamate?A. Secondary standard reagentB. Precipitating agentC. Chelating agentD. Primary standard reagent
1. is pH scales is strictly btw 0 and 14? if not, why? 2. what is CSTR? is this heterogenous? is this concentration depends on location? 3. is steady state, mass can enter ot not? leave the control volume or not?
When working with starch indicator is not one of the things to be considered? A. The indicator should be prepared fresh. If kept waiting, a substance called dextrose is released as a result of bacterial breakdown. Since this substance is reducing, it causes excessive consumption of S2O32-. B. Since the presence of substances such as gelatin and alcohol prevents the formation of amylose-I2 adsorption compound, it should not be present in the environment. C. The indicator sensitivity decreases with increasing temperature. Therefore, it should be worked at room temperature. D. Since starch is not soluble in water, the starch solution must be dissolved in alcohol while being prepared.
1. Compare your experimental value for Ksp of Ca(OH)2 with the literature value (Ksp = 8.0 × 10-6 at 25°C). Account for any difference. (Experimental value: Trial 1- 1.0061824 x 10^-5; Trial 2- 8.001504 x 10^-6). 2. Cite possible sources of error in the experiment. 3. Why must the solution be saturated when its solubility is determined?4. Is Ca(OH)2 more soluble in aqueous solution containing calcium ions or in pure water? Explain your observation interms of shift in equilibrium and in terms of the ion product in relation to Ksp.
1. Will a 5% preparation of caffeine citrate compounded in citrate buffer, pH 4.8 with no additional co-solvents be a solution – Yes or No? Explain. The MW of caffeine is 194.19 Da and that of caffeine citrate is 386.3 Da. The intrinsic solubility of caffeine is 2.17g/100 mL. please explain the answer.
Ali has measured the oxidative stability of palm oil sample under accelerated storage condition at 60*C for 6 days The following data were recorded for the peroxide value and p anisidine value of the palm oil after 5 days of storage time: Sample weight 1.0030 g Concentration of NazSzO3 = 0.001 N Volume of NazSzO3 titrated for sample solution = 1.35 ml Volume of NazSzO3 titrated for blank solution 0.20 ml Absorbance for sample solution = 0.907 Absorbance for blank solution 0.203 Calculate: i) peroxide value ii) p-anisidine value iii) TOTOX value
At 25oC the Ksp for PbCl2 is 1.6 × 10–5. See Periodic Table Calculate Q for the following: 125.0 mL of 0.0200 M Pb(NO3)2 is mixed with 75.0 mL of 0.0200 M NaCl at 25oC