The following pH data were collected in the analysis of water from a lake as part of an acid rain study: 4.17, 4.20,4.19,4.23, 4.22, 4.14, 4.20, and 4.15. The mode is
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The following pH data were collected in the analysis of water from a lake as part of an acid rain study: 4.17, 4.20,4.19,4.23, 4.22, 4.14, 4.20, and 4.15. The mode is
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- The pH of a saturated soloution of calcium hydroxide, Ca(OH)2, (lime water) was found to be (1.241x10^1). From this, find the Ksp for calcium hydroxide. Express your answer to three significant figures. Note: Your answer is assumed to be reduced to the highest power possible.Outline the change in composition of a solution of the salt of a triprotic acid as the pH is changed from 1 to 14.For biological and medical applications it is often necessary to consider proton transfer equilibria at body temperature (37 °C). The value of Kw for water at body temperature is 2.5 x 10-14 (a) What are the va lue of [H3O+) and the pH of neutral water at 37 °C. (b) What is the molar concentration ofOH- ions and the pOH of neutral water at 37 °C?
- Calculate the pH of a 2.00 M Na2CO3 given that the pKa’s of the first and second dissociation of H2CO3 (aq) acid are 6.37 and 10.32, respectively.State the limits to the generality of the expression for estimating the pH of an amphiprotic salt solution. Suggest reasons for why these limitations exist.Atmospheric CO2 levels have risen by nearly 20% over the past 40 years from 315 ppm to 380 ppm. A. Given that the average pH of clean, unpolluted rain today is 5.4, determine the pH of unpolluted rain 40 years ago. Assume that carbonic acid (H2CO3) formed by the reaction of CO2 and water is the only factor influencing pH.CO2(g)+H2O(l)←→H2CO3(aq) Express your answer using one decimal place B. What volume of CO2 at 25 ∘C and 1.0 atm is dissolved in a 23.0-L bucket of today's rainwater? Express your answer using two significant figures.
- When acidulated water (dil.H2SO2solution) is electrolysed, will the pH of the solution be affected? Justify your answer.The dissociation expression of a dilute aqueous solution of acetic acid is shown as: CH3COOH(aq) + H2O(l) <-> CH3COO-(aq) + H3O+(aq) True FalseThe solution of total volume 0.50 L was prepared by the addition of 0.10 moles of KF to sifficient water. What are the major species of the solution and pH ?
- A 25.0-mL aliquot of vinegar was diluted to 250 mL in a volumetric flask. Titration of 50.0-mL aliquots of the diluted solution required an average of 25.23 mL of 0.09041 M NaOH. Express the acidity of the vinegar in terms of the percentage (w/v) of acetic acid.which of the following is secondary standard ? A) hydrochloric acid B) sodium oxalate , C) potassium hydrogen phthalate D) sodium carbonate Explain plzCalculate the pH, pOH, and fraction of solute protonated or deprotonated in the following aqueous solutions: (a) 0.150 M CH3CH(OH)COOH(aq) (lactic acid), (b) 2.4 x 10-4 M CH3CH(OH)COOH(aq), (c) 0.25 M C6H5SO3H(aq) (benzenesulfonic acid). The appropriate values for pKa or pKb are given inthe table.