Measurements show that the pH of a particular lake is 4.0.What is the hydrogen ion concentration of the lake?(A) 4.0 M (B) 10-10 M(C) 10-4 M (D) 104 M
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Measurements show that the pH of a particular lake is 4.0.
What is the hydrogen ion concentration of the lake?
(A) 4.0 M (B) 10-10 M
(C) 10-4 M (D) 104 M
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- Calculate the pH in water that is in equilibrium with calcite, but at the pre-industrial level of CO2 (280 ppm) and at the projected level in year 2100 with current international climate agreements (800 ppm). Ignore temperature and ionic strength effects.. An analysis water from well No 9 of the Manhattan beach, California, water composition showed : pH=7.8; silica: 19.2 mg SiO2/liter; calcium = 60 mg Ca2+/liter ; magnesium = 29.16 mg Mg2+/liter; sodium=78.2 mg Na+ /liter; potassium : 42.9 mg K+ /liter; bicarbonate= 292.8 mg HCO3 - /liter; sulfate=134.82 mg S04 2- /liter; chloride = 99.4 mg Cl- /liter and nitrate =6.2 mg NO3 - /liter. The relative atomic masses are: Si=28; Ca=40; Mg=24.3; Na= 23; K=39; O=16; H=1; C=12; S=32; Cl=35.5; N=14. (a) Calculate the ionic balance (b) Is the water analysis satisfactory from the point of view of analytical accuracy? Justify your answerMeasurements show that the pH of a particular lake is 4.0. What is the hydrogen ion concentration of the lake? (A) 4.0 M (B) 10-10 M (C) 10-4 M (D) 10 4M
- What is the concentration of DIC in the ocean if the atmospheric concentration of CO2 is 411 ppm and the pH of the ocean is 8.1?Estimate the pH of a 7.18 x 106 M HF solution. You can calculate the lowest possible pH, knowing that the actual value will be higher. Your answer should contain 3 decimal places as this corresponds to 3 significant figures when dealing with logs. pH will be above Select the solution with the highest pH. Multiple Choice 0.0225 MLIOH 0.0225 MH2CO3 0.0225 MCH3NH2A 1L distilled water sample is allowed to equilibrate with the atmosphere. a) The global average CO2 content in the atmosphere is 0.0355% as of 1991 and is increasing at a rate of ~ 1% per year. What is the pH of the sample? NOTE: Consider 2021. b) 5 ml of 1M NaOH was added to the sample and allowed to equilibrate with the atmosphere. Find the pH neglecting the dilution effects. Hint: use charge balance equation. c) Find the pH immediately after the addition was done in 1b. d) Explain the reason for the observed difference in pH in 1b and 1c.
- what is the pH of a 0.0250 M solution of calcium Hydroxide? A) 12.40 B) 1.60 C) 1.70 D) 12.30Explain why pure water has the maximum water potential.Scientists are interested in investigating how limestone can be used to remediate the effects of acid rain. They collect water from a lake that has recently been exposed to acid rain. They divide the water into 10 different tanks and add different amounts of limestone to nine of the tanks. No limestone is added to one of the tanks. The pH of the water in the tanks is measured before the limestone is added and once every hour for 24 hours. (f) Identify the independent variable in this investigation. (g) Identify the dependent variable in this investigation. (h) Identify the control group in this investigation. (i) Describe one additional variable that has not been mentioned that could affect the results of the investigation. (G) Describe a modification that could be made to the investigation that would affect the results.
- A team of investigators is out on a boat on a lake on a marvelous,sunny summer day, and they are taking water samples fromvarious depths in the lake so as to construct a plot of dissolvedO2 concentration versus depth, similar to the plot in Figure 1.16.When the investigators bring up a water sample from a depthof 20 m, why is it imperative that they measure its dissolved O2concentration immediately, rather than letting it sit on the deckfor 5 minutes? (Hint: Look at Figure 22.2A.The pHpH scale for acidity is defined by pH=−log10[H+] where [H+]is the concentration of hydrogen ions measured in moles per liter (M). A solution has a pH of 10.2. Calculate the concentration of hydrogen ions in moles per liter (M).If the pH of a voledronic acid solution is 5.8, and the voledronate concentration is 9 mM, what is the concentration of voledronic acid? (pKa=5.0) 1.4 0.5 185.2 20 379.5