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Solubility Equilibria: Overview01:09

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When a substance such as sodium chloride is added to water, it dissolves, forming an aqueous solution. The extent of dissolution is called solubility. The process of dissolution can exist in equilibrium, just like other chemical processes. Solubility equilibria are also called precipitation equilibria because the process of solubility can be reversible. The reverse of the solubility process is called precipitation.
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The minerals contained in all of the food we consume are essential for our organ systems. However, certain essential minerals, such as calcium, phosphorus, magnesium, manganese, and fluoride, largely affect bone health.
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Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Chȃtelier’s principle. Consider the dissolution of silver iodide:
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Group 17 elements, known as halogens, are nonmetals. At room temperature, fluorine and chlorine are gases, bromine is a liquid, and iodine a solid. Astatine is a highly unstable radioactive element, so currently, most of its properties are unknown due to its short half-life. Tennessine is a synthetic element also predicted to be in this group. 
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Minerals are essential nutrients that the human body needs in small amounts to work properly. They play a vital role in many bodily functions, such as building strong bones and transmitting nerve impulses. Some minerals are needed for hormone production or to maintain a normal heartbeat. Major minerals include calcium, phosphorus, potassium, sulfur, sodium, chlorine, and magnesium, while trace minerals include iron, manganese, copper, iodine, zinc, cobalt, fluoride, and selenium.
 
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In a precipitation reaction, aqueous solutions of soluble salts react to give an insoluble ionic compound – the precipitate. The reaction occurs when oppositely charged ions in solution overcome their attraction for water and bind to each other, forming a precipitate that separates out from the solution. Since such reactions involve the exchange of ions between ionic compounds in aqueous solution, they are also referred to as double displacement, double replacement, exchange reactions, or...
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Extraction and Analysis of Taiwanese Green Propolis
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化物含量,可用性和稳定性在基牙膏中

Mara Assef Leitão Lotif1, Lidia Audrey Rocha Valadas1,2, Peter Bottenberg3

  • 1Pharmacy Department, Pharmacy, Dentistry and Nursing College, Federal University of Ceara, 1210 Pastor Samuel Mulunga Street 60430372, Fortaleza, Ceara, Brazil.

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PubMed
概括

巴西红色石牙膏显示稳定可溶性化物12个月. 然而,在老化24个月后,化物度显著下降.

关键词:
牙腐烂是指牙的腐烂.牙的价格 牙的价格自然产品是自然产品的产品.

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科学领域:

  • 口腔健康 口腔健康
  • 材料科学 材料科学 材料科学

背景情况:

  • 化物牙膏对于预防牙至关重要.
  • 巴西红色 (BRP) 具有潜在的治疗特性.
  • 调查含有BRP的牙膏中化物的稳定性对于产品的有效性至关重要.

研究的目的:

  • 为了评估总化物 (TF),总溶性化物 (TSF) 和电离性化物 (IF) 在用巴西红色 (BRP) 配制的牙膏中的稳定性.
  • 在24个月的时间内确定老化对BRP牙膏化物含量的影响.

主要方法:

  • 制造了一种含有碳酸和单酸 (MFP) 的牙膏,含有1500μg/g化物.
  • 使用离子特异电极 (ISE) 测量化物度 (TF,TSF,IF) 在0,12和24个月.
  • 对来自多个批次的五批进行了重复分析.

主要成果:

  • 12个月后,TF的范围从1198.9到1443.6 ppm F,TSF从869.6到965.8 ppm F,IF从223.5到269.7 ppm F.
  • 24个月后,TF在763.5到1083.1ppmF,TSF在552.3到758.4ppmF,IF在102.2到174.7ppmF之间.
  • 可溶性化物 (TSF和IF) 显示了长达12个月的相对稳定性,但在24个月内显著下降.

结论:

  • 在最初的12个月里,BRP牙膏表现出可接受的化物稳定性.
  • 在24个月的时间点观察到可溶性化物度的显著降低.
  • 可能需要进一步的研究,以优化含有BRP的牙膏中长期化物稳定性的配方.