11:29 1 t of a 2.54-cm rainfal urse.html?courseld=16531331&OpenVellumHMAC-0ctcef792b8bd319204877fe01aed550#10001 Update : The presence of SO2 in the atmosphere and the sulfuric acid that it produces result in the phenomenon of acid rain. Uncontaminated rainwater is naturally acidic and generally has a pH value of about 5.6. The pH of acid rain is about 4. This acidity has affected many lakes in northern Europe, the northern United States, and Canada, reducing fish populations and affecting other parts of the ecological network within the lakes and surrounding forests. Part A If the pH of a 2.54-cm rainfall over 3900 km? is 3.90, how many kilograms of sulfuric acid, H2SO,, are present, assuming that it is the only acid contributing to the pH? For sulfuric acid, K is very large and K is 0.012. The pH of most natural waters containing living organisms is between 6.5 and 8.5, but freshwater pH values are far below 6.5 in many parts of the continental United States. At pH levels below 4.0, all vertebrates, most invertebrates, and many microorganisms are destroyed. More than 300 lakes in New York State contain no fish, and 140 lakes in Ontario, Canada, are devoid of life. The acid rain that appears to have killed the organisms in these lakes originates hundreds of kilometres upwind in the Ohio Valley and Great Lakes regions. Some of these regions are recovering as sulfur emissions from fossil fuel combustion decrease, in part because of the U.S. Clean Air Act of 1990, which required that power plants reduce their sulfur emissions by 80%. Express your answer to two significant figures and include the appropriate units. > View Available Hint(s) ? 3.0 • 106 kg Submit Previous Answers X Incorrect; Try Again; 5 attempts remaining ovide Feedback Next > Pearson Copyright © 2021 Pearson Education Inc. All rights reserved. I Terms of Use l Privacy Policy Permissions I Contact Us I MacBook Air DD 80 888 F7 19 F10 F12 F3 FS $ & 7 8 9 4 %3D delete { R Y U %3D F G H K L return ? V N M shift command option Send a chat V B

Both images attached go together Also please calculate concentration

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Weighted average if these values Value-7.00, 8.00, 9.00 Weight-75.0%, 15.0%, 10.0%

When you are calculating water hardness, all the compounds in the water are considered to be -------- ? Select one:   Limestone CaCO3 Hydrates MgCO3

Find the Salinity based on the graph

Solution 1 Solution 2 Solution 3 Solution 4 Solution 5 Concentration iron(III) nitrate 0.00200 0.00200 0.00200 0.00200 0.00200 [Fe(NO3)3] (M) Concentration potassium thiocyanate 0.00200 0.00200 0.00200 0.00200 0.00200 [KSCN] (M) Volume Fe(NO3)3 (mL) 5.00 5.00 5.00 5.00 5.00 Volume KSCN (mL) 5.00 4.00 3.00 2.00 1.00 Volume DI water (mL) 0.00 1.00 2.00 3.00 4.00 Initial concentration [Fe3+] (M) 0.00100 0.00100 0.00100 0.00100 0.00100 Initial concentration [SCN‍] (M) 0.00100 0.000800 0.000600 0.000400 0.000200 Absorbance 0.269 0.192 0.154 0.104 0.052 Equilibrium [FeSCN2+] (M) 0.000198 0.000141 0.000113 0.0000765 0.000038 Equilibrium constant Kc Average Kc

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