Santa Monica College Water Worksheet

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Santa Monica College

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Depth (m) In pure water, there will be an equal amount of both the hydrogen and hydroxide ions in the solution, making the solution neutral. When substance dissolve in water, they can make the solution acidic of basic depending on whether they cause the release of H* or OH. Pure water has a pH of 7 (neutral). If a glass of pure water is allowed to sit out and come into equilibrium with the atmosphere, it will have a pH around 5, or will be slightly acidic as the CO₂ in the atmosphere will cause the release of H* in the water, making it slightly acidic. Seawater has a pH of 8.1 (ranges from 8.0-8.3) due to the dissolved substances in the water release hydroxide and making it slightly basic. As you go deeper into the ocean, the pH of seawater decreases (becomes more acidic) because of the respiration of organisms (which release CO2 into the water, there is no sunlight at depth and so no photosynthesis to use up that CO₂). 0 1000 2000 3000 4000 24. Using figure 7 (below), where is pH the lowest in the ocean? 7.6 7.8 pH Low-pH layer is caused by marine animal respiration. 8.0 8.2 Surface pH = 8.1, which is slightly alkaline. Below the low-pH layer, pH gradually increases with depth. Figure 7: pH on the x-axis versus depth on the y axis in the ocean. T D -United States Mexico > MAY Pacific Ocean Canada LO Peru VENDRES Bolivia Chile Atlantic Ocean F- Brazil Papequay Argentina 3* 2019 Copyright © Ontheworldman.com Figure 6: Map of the world enland P ACIDS AND BASES Topa mer Senegal Se Se Pute tanlo Alueria Atlantic Ocean Niger Nigeria Arctic Ocean Esbya Egyar Chud Angola SMA Ad ker Zamiq Southern Ocean Sudan Saudi South Ethiopla Sudan Arabia penyo 1 Burundi 7. Malow J. Rwanda 4 Armenia 5. Azerbajon 6 Bahrain 7 Qutar & Albania 9 Andors thin Tom A Seychelles Russio 13 Corch Republic 14 Vatican City S 15. Kosovo 16 Lichtenstein 17. ur 18 Moder India V L 10 Belgrum 13. Montegre 11 Bosnia and Herzega 20 leth Movedos 12 Crontie ZL Netherlands China Indian Ocean 22. Son Me 21 Serbia 24. Slovents 25. Switzerland 26 Saint Vincent and the Grenadines Indonesia 22. The Aleutian Islands, Alaska? (Circle one) Saltier/ Fresher 23. Antarctica (Circle one) Saltier/ Fresher Australia World Map R Pacific Ocean New Zealand Circle whether the area of the world described would be saltier or fresher than the average ocean value. 19. Gulf of Mexico? (Circle one) Saltier/ Fresher 20. Mediterranean Sea? (Circle one) Saltier/ Fresher 1000 Mies 21. Brazil, right where the Amazon River empties into the Atlantic (Circle one) Saltier/ Fresher 2000 Pacific Ocean In water, there is also a small amount of dissociation of the water molecules as the water constantly dissociates and reforms. This is written like this: H2O H+ + OH- Mantand NAZCA190030 An acid is a substance which releases hydrogen ions when dissolved in water (H+). The higher the concentration of H*, the more acidic a substance. A base is a substance which releases hydroxide ions when dissolved in water (OH-). A solution which releases a lot of OH- is said to be basic or alkaline.
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I was having a hard time with this subject, and this was a great help.

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