{"id":7571,"date":"2021-06-08T21:56:52","date_gmt":"2021-06-08T21:56:52","guid":{"rendered":"https:\/\/opentextbc.ca\/introductorychemistry\/part\/chapter-11-solutions\/"},"modified":"2021-10-04T21:01:42","modified_gmt":"2021-10-04T21:01:42","slug":"chapter-11-solutions","status":"publish","type":"part","link":"https:\/\/opentextbc.ca\/introductorychemistry\/part\/chapter-11-solutions\/","title":{"raw":"Chapter 11. Solutions","rendered":"Chapter 11. Solutions"},"content":{"raw":"More than 70% of the earth\u2019s surface is covered by a very important solution \u2014 seawater. It is likely that without seawater, no life would exist on Earth.\r\n\r\nAt its simplest, seawater is mostly H2<\/sub>O. But about 3.5% of seawater is dissolved solids, mostly NaCl but other ions as well. Table 11.1 \"Percentage by Mass of Ions in Seawater and Blood\" lists the percentage by mass of the various ions in seawater.\r\n\r\nBecause it is highly likely that life on Earth originated in the oceans, it should not be surprising that many bodily fluids resemble seawater \u2014 especially blood. Table 11.1 also lists the percentage by mass of ions in a typical sample of blood.\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n
Table 11.1 Percentage by Mass of Ions in Seawater and Blood<\/caption>\r\n
Ion<\/th>\r\nPercentage in Seawater<\/th>\r\nPercentage in Blood<\/th>\r\n<\/tr>\r\n<\/thead>\r\n
Na+<\/sup><\/td>\r\n2.36<\/td>\r\n0.322<\/td>\r\n<\/tr>\r\n
Cl\u2212<\/sup><\/td>\r\n1.94<\/td>\r\n0.366<\/td>\r\n<\/tr>\r\n
Mg2+<\/sup><\/td>\r\n0.13<\/td>\r\n0.002<\/td>\r\n<\/tr>\r\n
SO4<\/sub>2\u2212<\/sup><\/td>\r\n0.09<\/td>\r\n\u2014<\/td>\r\n<\/tr>\r\n
K+<\/sup><\/td>\r\n0.04<\/td>\r\n0.016<\/td>\r\n<\/tr>\r\n
Ca2+<\/sup><\/td>\r\n0.04<\/td>\r\n0.0096<\/td>\r\n<\/tr>\r\n
HCO3<\/sub>\u2212<\/sup><\/td>\r\n0.002<\/td>\r\n0.165<\/td>\r\n<\/tr>\r\n
HPO4<\/sub>2\u2212<\/sup>, H2<\/sub>PO4<\/sub>\u2212<\/sup><\/td>\r\n\u2014<\/td>\r\n0.01<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\nMost ions are more abundant in seawater than they are in blood, with some notable exceptions. There is far more hydrogen carbonate ion (HCO3<\/sub>\u2212<\/sup>) in blood than in seawater; indeed, it is the third most common ion in blood. This difference is significant because the HCO3<\/sub>\u2212<\/sup> ion and some related species [CO3<\/sub>2\u2212<\/sup>, CO2<\/sub>(aq)] have an important role in controlling the acid-base properties of blood. Although there is a negligible amount of the two hydrogen phosphate ions (HPO4<\/sub>2\u2212<\/sup> and H2<\/sub>PO4<\/sub>\u2212<\/sup>) in seawater, there is a small amount in blood, where these ions affect acid-base properties. Another notable difference is that blood has a negligible amount of the sulfate ion (SO4<\/sub>2\u2212<\/sup>), but this ion is present in seawater.\r\n\r\nGold is present in seawater \u2014 but only a tiny amount. A current estimate of the amount of gold is about 1 part per every 1 \u00d7 1013<\/sup> parts of seawater, which makes the extraction of gold from seawater unfeasible. However, it does mean that there are about 1.4 \u00d7 1014<\/sup> g of gold in the world\u2019s oceans!\r\n\r\n[caption id=\"attachment_615\" align=\"aligncenter\" width=\"400\"]\"There Figure 11.1 \"Ocean.\" There are approximately 1.4 \u00d7 1014<\/sup> g of gold in the oceans, but extracting it effectively is beyond current technologies.[\/caption]\r\n\r\nA solution is a homogeneous mixture<\/em> \u2014 a mixture of two or more substances that are so intimately mixed that the mixture behaves in many ways like a single substance. Many chemical reactions occur when the reactants are dissolved in solution. In this chapter, we will introduce concepts that are applicable to solutions and the chemical reactions that occur in them.\r\n

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