Q: What is [H] in a 0.430 M solution of acrylic acid, CH2CHCOOH (Ka = 3.16 × 10 5)? %3D
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Q: What is the pH of a 0.223 M LINO2 solution at 25 °C (Ka for HNO2 = 4.0 x 104)? (the answer should be…
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Q: For a weak acid with a pKa of 6.0, show how you would calculate the ration of acid to salt at pH 5.
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Q: Can any of the following be used as primary standards:NaOH, H2SO4, HNO3? * .Explain your answer
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Q: How does pKa relate to acid strength?
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Q: Calibrate the pH meter @ pH 4, 7 and 10.
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Q: Describe 3 methods of pH determination.
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Q: [b] Derive the following question ;- pH = pK, + log [ Cs/C.1
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Q: What is the pH value of sodium hydroxide if it has a power of hydrogen (pOH) of 2.46?
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Q: 6. What is the pH of 0.5 M nitrous acid (HNO2) ( Ka = 4.5 x 10-4) %3D www
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Q: Deionized water at 10c in which Kw = 2.89e-15 , pkw= 14.539 what is the pH , poH , [OH], [H3O+]?
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Q: % A- vs pH 100 90 80 70 60 & 50 40 30 20 10 ... ... .. 8. 10 11 PH Use the data above to calculate…
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Q: [OH-] = 7.9 x 10-3 M Express your answer using two dècimal places. ΑΣΦΦ pH =
A: Given that: [OH-] = 7.9 × 10-3 M
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In 100-200 words, Differentiate acidimetry from alkalimetry.
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- Suppose a group of students put 2.92 grams of an unknown solid acid into a 250-mL volumetric flask and filled it up to the mark with deionized water. After this they pipetted out 15.75 mL of a 1.78 M NaOH(aq) solution into another 250-mL volumetric flask and filled it up to the mark with deionized water. The students were given a pH meter that was already calibrated by their teaching assistant (T.A.) and they got the following result shown in the table below. Calculate the Molarity of the unknown solid acid. Hint: You can approximate the endpoint of the titration by taking the average volume between two consecutive titrant volume reading and you can assume that it is a 1:1 stoichiometry ratio between the acid and OH-(aq). VNaOH (mL) pH VNaOH (mL) pH 0 1.97 15 3.43 1 2.05 16 3.57 2 2.12 17 3.65 3 2.20 18 3.77 4 2.29 19 3.88 5 2.38 20 4.01 6 2.47 21 4.23 7 2.58 22 4.65 8 2.69 23…For Co3+, enter an equation that shows how the cation acts as an acid. Express your answer as a chemical equation including phases.If the Hydrogen ion concentration [H+] of certain slurry sample of soil with water is 3.5 x 10-6 M, what is the pH of the soil sample? Is the soil acidic, neutral or alkaline. Write your computation in the reply section. Highlight your final answer.
- Exactly 10.00-mL aliquots of a solution containing phenobarbital were measured into 50.00-mL volumetric flasks and made basic with KOH. The following volumes of a standard solution of phenobarbital containing 2.000μg/mL of phenobarbital were then introduced into each flask and the mixture was diluted to volume: 0.000, 0.500, 1.00, 1.50, 2.00 mL. The fluorescence of each of these solutions was measured with a fluorimeter, which gave values of 3.26, 4.80, 6.41, 8.02, 9.56, respectively. a. plot the data. b. derive a least squares equation for the data plotted in (a). c. find the concentration of phenobarbital from the equation in (b). d. calculate a standard deviation for the concentration obtained in (c).Treatment of ammonia with phenol in the presence of hypochlorite yields indophenol, a blue product that absrobs light at 625 nm, which can be used for the spectrophotometric determination of ammonia. ocr -OH • NH, indophenol anion To determine the ammonia concentration in a sample of lake water, three samples are prepared. In sample A, 10.0 mL of lake water is mixed with 5 mL of phenol solution and 2 mL of sodium hypochlorite solution, and diluted to 25.0 mL in a volumetric flask. In sample B, 10.0 mL of lake water is mixed with 5 mL. of phenol solution, 2 mL of sodium hypochlorite solution, and 2.50 mL of a 5.50 x 10-4 M ammonia solution, and diluted to 25.0 mL. Sample C is a reagent blank. It contains 10.0 mL of distilled water, 5 mL of phenol solution, and 2 ml. of sodium hypochlorite solution, diluted to 25.0 mL. The absorbance of the three samples is then measured at 625 nm in a 1.00 cm cuvette. The results are shown in the table. Sample Absorbance (625 nm) A 0.374 В 0.621 0.045…pH = −log[H+] where [H+] is the hydrogen ion concentration, measured in moles per liter. Solutions with a pH-value of less than 7 are acidic; solutions with a pH-value of greater than 7 are basic; solutions with a pH-value of 7 (such as pure water) are neutral. Black coffee has a pH of 5 and pure water has a pH of 7. Compare the pH of each and determine how much more acidic black coffee is than pure water.
- The spectroscopic data given in the table was generated for two different concentrations of a solution. Concentration (M) Absorbance 0.0141 0.1073 0.1135 0.6005 What is the slope of the line formed by these points? m = What is the y-intercept? b= || What is the concentration of a solution with an absorbance of 0.377? concentration: MThe value of Q is 1.0*10^-4Give (in order) the correct coefficients to balance the following equation:NH3+ O2→ NO + H2O 4, 4, 4, 6 2, 3, 2, 3 1, 1, 1, 1.5 4, 5, 4, 6 2, 2, 1, 3
- The pH reading of a sample of each substance is given. Calculate the hydrogen ion concentration of the substance. (Give your answers in scientific notation, correct to one decimal place.) (a) Tomatoes: pH = 4.1 [H+] = х 10 M (b) Human blood: pH = 7.3 [H+] х 10 Mcan volumetry or electrogravimetry be used to measure lead concentrations in water?Write your complete solutions on yellow paper, round your answers to the appropriate number of significant figures, and box the final answer. The deadline for submission is at the end of the class. Note: You do not need to write your solutions for the items that can be derived from your calculators. 1. Three students (Saerom, Hayoung, and Jiwon) are asked to determine the ppm Ca in a drinking water sample by titration with EDTA. Each student performed five trials for the sample. The results in ppm Ca are the following: Saerom Hayoung Jiwon a. Get the mean, SD, and % RSD of each student's results. b. If the true value is 35 ppm, calculate the relative error of each student's results. c. Comment on the precision and accuracy of each student's results. The maximum % RSD and the relative error set by the lab is 5.0%. d. Use the following table to summarize your answers. Mean SD %RSD Relative Error Comment 31, 32, 33, 33, 32 35, 34, 34, 35, 34 35, 38, 33, 35, 37 Saerom Mean SD 95% CI…