Diverse Ion Effect
Diverse Ion Effect - Related Videos
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Plant Diversity - Concepts
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2019
From Water to Land Kingdom Plantae first appeared about 410 million years ago as green algae transitioned from water to land. Though challenging, this transition benefited early colonizers in several ways. Initially, most living organisms (including plants and animals) were ocean dwelling, making aquatic environments crowded and highly competitive. In contrast, land was a relatively uncolonized environment with ample resources and little to no predators or competitors. Terrestrial environments...
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Community Diversity - Concepts
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2019
Populations do not live in isolation; thus, every population interacts with others in certain ways. These interactions give rise to a network of populations. Hence, an ecological community is composed of such population networks of various species interacting with each other within the same area. These biological, or biotic, components may also closely interact with non-living, or abiotic, components, forming an ecosystem. Ecosystems may be as small as the microbial communities inside the human...
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Community Diversity - Student Protocol
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2019
Measuring Biodiversity in Areas with Different Disturbance Regimes ExpandNOTE: In this experiment, you will compare the biodiversity in a less disturbed area against a more highly disturbed area. HYPOTHESES: The experimental hypothesis could be that a less disturbed area will contain a greater diversity of species than a highly disturbed area. The null hypothesis could be that there will be no difference in diversity between less disturbed and highly disturbed areas. To begin, divide into...
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Community Diversity - Instructor Prep
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2019
Setting up for the Lab and Choosing Field Sites ExpandBefore the experiment, first ensure that the student computers have Microsoft Excel or Google Sheets installed. If using Excel, make sure the data analysis tool pack is loaded. Next, you will need to identify the two fields where the students will take measurements. Both fields should ideally have lengths in any direction of at least 30 meters. One field should be a shrubby or weedy field that has not been mowed recently. The second field...
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Animal Diversity - Concepts
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2019
Kingdom Animalia is composed of a range of organisms united by a set of common characteristics. Barring a few exceptions, animals are multicellular eukaryotes that move, consume organic matter, and reproduce sexually. Although these attributes are shared, species within this kingdom are also extremely diverse. This diversity is due to adaptation of each species to a different niche. The niche of a species includes the area, function, and interrelationship of that species with other biotic and...
FAQs
Activity coefficients connect the measured concentration of a dissolved ion with its effective activity in solution. When an unrelated electrolyte increases ionic strength, these coefficients change, so the dissolved ions contribute less effectively to the equilibrium expression than their concentrations alone suggest. Accounting for activities therefore explains why solubility can increase beyond a concentration-based prediction.
Ionic strength changes the chemical environment surrounding charged species. Adding ions that do not participate directly in the equilibrium can reduce the effective activities of the dissolved ions, changing the balance represented by the equilibrium condition. The system responds by favoring additional dissolution, which makes ionic strength an important variable when interpreting sparingly soluble compounds.
The two effects influence solubility through different ionic relationships. A common ion is already present in the dissolution equilibrium and produces the common ion effect, whereas the diverse ion effect arises from ions outside that equilibrium. Comparing them helps distinguish direct participation by an equilibrium ion from indirect activity changes caused by the surrounding electrolyte.
Such predictions can become unreliable when a solution contains substantial electrolyte content that changes ionic strength and activity coefficients. In that situation, concentrations do not fully represent the effective activities governing equilibrium. The Diverse Ion Effect provides a framework for interpreting why an observed solubility or precipitation behavior may differ from an estimate based only on dissolved-ion concentrations.
In precipitation work, added electrolytes can alter the activities of ions involved in a sparingly soluble compound without becoming equilibrium ions themselves. That change may increase dissolution and affect the extent of precipitation. In qualitative inorganic analysis, recognizing this influence helps explain why separation or identification results depend on the composition of the surrounding electrolyte solution.
A separation scheme can account for how an added, nonparticipating electrolyte changes ionic strength and the effective activities of dissolved species. Because solubility may increase, the electrolyte environment can influence whether a compound remains precipitated or dissolves further. Considering this effect improves interpretation of selective precipitation behavior and the outcomes of multistep inorganic separations.