As ionic potential increases…

Consider the table of water quality data for a stream sample (below). One important cation is missing from this table. Assume that no ion pairs or solid precipitates are present in the sample. Fill in the four boxes labeled A, B, C and D  For A, format answer as: A, or A^#- / A^#+ if there is a charge For B-E, type the numerical value If needed, use E’s to designate scientific notation to make numbers fit in the blanks (ex: 0.1 = 1.00E-01; 10 = 1.00E+01). Concentration (mg/L) Concentration (mmoles/L) Charge Concentration (meq/L) Total alkalinity (titratable, as mg/L CaCO3) 294 pH 7.4 3.98E-05 3.98E-05 A B C D Mg2+ 30 1.234 2.469 Na+ 14 0.609 0.609 K+ 3 0.077 0.077 Total cation charges E pOH 6.6 2.51E-04 2.51E-04 Total orthophosphate P 0.05 2.30E-03 nitrate N 1.0 0.071 0.071 sulfate 86 0.895 1.791 chloride 40 1.130 1.130 DOC (mg of C/L) 2 0.2 HCO3- 357 5.85 5.85 Total anion charges 8.87 Charge balance 0.00% Calculated ionic strength* 0.014 *Needed for upcoming questions _______ B:  _______ C:  _______ D: _______ E: _______

A {L} L sample of stream water requires {mL} mL of {M} M HCl to titrate to pH 4.5. What is its alkalinity, reported in meq/L? Provide 3 significant figures in your answer. Attachments are enabled so you can show work here or in the “show work” question towards the bottom of the exam.

About how long did you spend working on module 2 (including watching videos)?

Which 2 cations are most likely to undergo hydrolysis in water? Select 2

Which of the following most helped you learn this week? 

Ionic potential increases when…

(Use the information in the previous question to answer this one) c) If [Cutotal] = {T} M and pH = {pH}, what is the concentration of free Cu2+ in the water sample?  Format answer in scientific notation and round to 3 significant figures.

The brakes in a car increase in temperature by ΔT when bringing the car to rest from a speed v. How much greater would ΔT be if the car initially had twice the speed? You may assume the car stops fast enough that no heat transfers out of the brakes. *BE SURE TO WRITE YOUR ANSWER ON YOUR PAPER AND SUBMIT TO GRADESCOPE*

A client is using psyllium hydrophilic mucilloid (Metamucil) to promote evacuation of stool. What is the action of this medication?