what happens when lead with reacts calciumhydroxide
Answers
Answer:
Calcium reacts slowly with water. ... The reaction forms calcium hydroxide, Ca(OH)2 and hydrogen gas (H2). The calcium metal sinks in water and after an hour or so bubbles of hydrogen are evident, stuck to the surface of the metal.
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Explanation:
9.4.1 Composition
Calcium hydroxide, Ca(OH)2, has a long history of use in dentistry for pulp capping and it is available in a number of forms. These include as a supersaturated solution, a hard setting cement and also a light-curable material. Its key feature is its high alkalinity (pH 11–12.5), and this can be achieved using calcium hydroxide powder mixed with pure water to the consistency of a light paste [34]. However, used in this way, calcium hydroxide does not set, has no mechanical strength and consequently there is the danger of it being displaced by the forces involved in placing a restorative material over it [35]. Also in this form it cannot be used directly under any resin-based restoration (composite resins, compomers and resin-modified glass-ionomers) because it is hydrophilic and would interfere with bonding systems. To overcome this problem, calcium hydroxide formulations that are capable of undergoing some sort of setting reaction, and thus building up a degree of mechanical strength, are generally used. However, they have slightly different properties and cannot replace supersaturated calcium hydroxide solutions in all clinical situations.
Setting calcium hydroxide cements are typically based on liquid alkyl salicylates, and they are supplied to the clinician as a two-paste pack [36]. Alkyl salicylates that have been used include methyl salicylate, isobutyl salicylate and 1-methyl trimethylene disalicylate [37]. These cements set because the alkyl salicylate contains a phenolic –OH group which has acid character, and this means it can react with the alkaline calcium hydroxide [38].
Calcium hydroxide formulations of this type do not contain water, as the composition shown in Table 9.1 makes clear. This formulation is that of Dycal®, a calcium hydroxide material that has been available for many years and is widely respected
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