Does anyone know what normal oxygen levels are in rivers?
534827
Dissolved oxygen levels usually range from 6 to 14 mg/L. \n\nRemember, ambient temperature will have a significant impact on your readings, because the solubility of oxyden in water falls with a rise in temperature. So you'll need to take that into consideration while writing up your findings. \n\nI suggest that you take some readings at different times of the day, to establish a baseline. \n\nHope that helps.
634546
Blood contains hemoglobin, which enables blood to be transported through the body. The hemoglobin molecule has four sites for oxygen to attach.  When all four positions are filled, the hemoglobin is fully (100%) saturated.\n\nFor a person breathing room air, at not far above sea level, acceptable normal ranges are from 95 to 100 percent.
623955
Warm water holds less oxygen than cool water, so it may be saturated with oxygen but still not contain enough for survival of aquatic life.
960502
Since the oxygen is collected over water, you must subtract out the water vapor pressure to determine the pressure due to just the oxygen.\n\n722.2 mmHg - 21.1 mmHg = 701.1 mmHg = 0.922 atm due to O2\n\n0.276g KClO3 = 0.00175 moles KClO3 (molar mass = 158 g/mol)\nSince KClO3 decomposes to form O2 in a 2:3 ratio, the number of moles of O2 produced = 0.00262 moles O2\n\nPV=nRT\n(0.922 atm) V  = 0.00262 mol (0.08206)(296.2K)\n\nSolving for the volume due to the O2,  V = 691 mL
914690
a) You friend is wrong. Even pure water has some OH- and H3O+ ions. The concentrations are very low (10^-7), but they are there.\n\nb) There is Clorine in Clorox (sodium hypochlorite), and the bleaching reaction causes oxidation.
477933
Check out the link below:\n\nhttp://www.respiratorygroup.com/products/high_pressure/med_o2_spec.aspx
904142
The amount of oxygen dissolved in water is measured in mg O2/liter of water and varies with temperature and atmospheric pressure at the surface. It can be anywhere from 5-12 (approximately) mg/liter.
112574
plants use N, K and P to live. the more phosphorus(phosphate) in the water the more plants it can support. the more plants the less oxygen for fish.\nso high phosphate levels can cause low oxygen levels.
282642
actually, pure water does not have a pH of 7.0, it is slightly acidic, around 5.6-5.8 from what i have seen at work.
593175
Cal Salmon River Rafting  it's a level 5 course  =)
1153677
Roughly 1,800! The following link might prove useful: -\n\nhttp://en.wikipedia.org/wiki/Category:Rivers_of_Spain
915044
7.04 grams\n\n15 grams of water is .44 mol and according to the equation, the ratio between water and oxygen is2:1 so if .44 mol of water is decomposed. then .22 mol of oxygen will be produced. and .22 mol of oxygen is .22 *32 =7.04grams
297566
Pure water (which is impossible to get, by the way), has a pH of exactly 7.0. This is because the Kw of water is 1.0e-14, so you get 1.0e-7 M of hydronium ions (and 1.0e-7 M of hydroxide ions). The pH is defined as -log[H+], so the negative log of 1.0e-7 is exactly 7.0.\n\nEDIT: sammi, 7.2 would be slightly basic.
640954
From 90% to 100% saturated of oxygen (at 2800 meters over sea level)\n\nMeaning your saturation is fine.\n\nWhy do you need it measured?
663852
you can give this a try :)\n\nwww.aarc.org/headlines/home_oxygen_issue/letter.html
908306
shouldn't you be doing your homework? all you need is the normal ranges for the pH, PCO2, PaO2, and bicarb to interpret this.
11445
You need to be a little more specific. Would that be in water quality, oxygen in blood, or soil? To measure water quality they just use dissolved oxygen meter, which exploits the electrochemical properties of the water. Or you could do a Winkler titration.