Lead Iodide
Lead Iodide - Related Videos
09:09
Annexin V and Propidium Iodide Labeling
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2023
Staining with annexin V and propidium iodide (PI) provides researchers with a way to identify different types of cell death—either necrosis or apoptosis. This technique relies on two components. The first, annexin V, is a protein that binds certain phospholipids called phosphatidylserines, which normally occur only in the inner, cytoplasm-facing leaflet of a cell’s membrane, but become “flipped” to the outer leaflet during the early stages of apoptosis. The second component is the DNA-binding...
07:34
Modified Annexin V/Propidium Iodide Apoptosis Assay For Accurate Assessment of Cell Death
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Cited by 543 •
2011
An accurate method for the assessment of cell death is described. The protocol improves upon conventional Annexin V/ propidium iodide (PI) protocols, which display up to 40% false- positive events in cell lines and primary cells from a broad range of animal models.
04:31
Differential Nuclear Staining Assay: An Assay to Determine Mitocan Cytotoxicity by Propidium Iodide and Hoechst Double Staining
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2025
This video demonstrates a nuclear staining method to detect the cytotoxic effect of mitocan on drug-sensitive cancer cells and healthy variants. The double staining with DNA-binding dyes such as propidium iodide and Hoechst dye provides a clear distinction between the dead and live cells, thus helping to assess the cytotoxicity of the drug.
09:40
Lead Analysis of Soil Using Atomic Absorption Spectroscopy
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2023
Source: Laboratories of Margaret Workman and Kimberly Frye - Depaul University Lead occurs naturally in soil, in levels ranging from 10-50 ppm. However, with the widespread use of lead in paint and gasoline in addition to contamination by industry, urban soils often have concentrations of lead significantly greater than background levels – up to 10,000 ppm in some places. Ongoing problems arise from the fact that lead does not biodegrade, and instead remains in the soil. Serious health risks...
08:12
Low Pressure Vapor-assisted Solution Process for Tunable Band Gap Pinhole-free Methylammonium Lead Halide Perovskite Films
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Cited by 2 •
2017
Here, we present a protocol for the synthesis of CH3NH3I and CH3NH3Br precursors and the subsequent formation of pinhole-free, continuous CH3NH3PbI3-xBrx thin films for the application in high efficiency solar cells and other optoelectronic devices.
FAQs
The balance between dissolved lead(II) ions, iodide ions, and the sparingly soluble solid determines the outcome. When the ionic conditions favor the solid phase, the solubility equilibrium shifts toward PbI₂ formation. This equilibrium perspective explains why precipitation is not simply an all-or-nothing reaction and connects the visible result with changes in ion concentrations at the molecular scale.
An ionic equation focuses on the reacting lead(II) and iodide ions rather than treating all dissolved substances as equally involved. It therefore links the macroscopic appearance of a precipitate with the specific ions responsible for forming the solid. In chemistry instruction, this representation helps distinguish the chemical change from spectator species that remain dissolved.
Temperature changes influence how lead iodide crystallizes from the surrounding solution. Heating and subsequent cooling can alter the conditions under which crystals develop, making crystal growth a useful complement to the initial precipitation event. Observing these changes helps students connect solubility behavior with crystallization, rather than viewing the yellow solid only as an instantaneous reaction product.
A basic demonstration combines aqueous lead(II) ions with aqueous iodide ions and observes the resulting solid formation. The visible change can then be considered alongside the ionic equation and the relevant solubility equilibrium. If crystal growth is being examined, heating and cooling are incorporated as temperature-changing stages, allowing the appearance of the material to be related to crystallization.
In qualitative analysis, the formation of lead iodide provides a visible indication that lead(II) ions and iodide ions have reacted under suitable aqueous conditions. The characteristic yellow solid gives the experiment an observable outcome that supports interpretation of ionic reactions and precipitation. It also allows learners to relate an analytical observation to solubility equilibrium and ion interactions.
Lead iodide contains lead, so laboratory work requires appropriate handling and controlled waste disposal. The material should be treated as a lead-containing chemical rather than discarded with ordinary waste. These precautions are part of responsible demonstrations and qualitative analysis because the educational value of observing precipitation does not remove the need to manage the compound safely.