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Jan 18, 2019 · Ammonium chloride ($\ce{NH4Cl}$) is the work-up reagent that quenches the magnesium alkoxide product of the Grignard addition. It is the reagent of choice as it is a proton source without being acidic; acidic conditions could result in protonation of the tertiary alcohol product and elimination to the alkene.
Ammonium chloride is prepared commercially by combining ammonia (NH 3) with either hydrogen chloride (gas) or hydrochloric acid (water solution): [3] NH 3 + HCl → NH 4 Cl. Ammonium chloride occurs naturally in volcanic regions, forming on volcanic rocks near fume-releasing vents (fumaroles).
- The Difference Between Mass and Weight
- Units of Mass and Weight
- Mass vs Weight Activities
- References
There are several differences between mass and weight. Mass is an intrinsic property of matter. It doesn’t change depending on where you measure it. It is a scalar value, which means it has magnitude, but no direction associated with it. The mass of an object is never zero. You measure mass with an ordinary balance on Earth or an inertial balance i...
We measure weight in grams, kilograms, ounces, and pounds. Technically, grams (g) and kilograms (kg) are units of mass. The SI unit of force is the Newton (N), with a 1 kg mass having a force of 9.8 N on Earth. The US unit of force is the pound (lb), while the unit of mass is something called a slug. A pound is the force required to move a 1 slug m...
Weight in an Elevator
One simple activity to see the difference between mass and weight is weighing yourself in an elevator. A digital scale works best because it’s easier to see the change in weight as the elevator ascends (increasing acceleration, which adds to gravity) and descends (negative acceleration, which decreases the effect of gravity). For a classroom activity, first have students weigh themselves (or an object) on a scale and discuss whether the value they obtain is mass, weight, or whether it matters...
Measuring Weight With Rubber Bands
You can compare the weights of objects by hanging them from rubber bands. On Earth, gravity affects a heavier object more than a lighter one and stretches the rubber band further. Predict what will happen when heavy and light objects are suspended from rubber bands on the ISS. What shape will the rubber band take? Do you expect there to be a difference between the way the rubber band responds to a heavy object compared to a light object?
Mass Cars
The easiest way to explore mass on Earth is to conduct experiments that move horizontally rather than vertically. This is because objects can’t change their position from the effect of gravity. Build a “mass car” and use an air pump to accelerate the mass across rollers or a low-friction track. Change the mass of the car, make a prediction about how this will change how far the car rolls, and perform an experimentto test the hypothesis. You can graph the distance the car moves compared to its...
Galili, Igal (2001). “Weight versus Gravitational Force: Historical and Educational Perspectives.” International Journal of Science Education. 23(1): 1073-1093.Gat, Uri. (1988). “The Weight of Mass and the Mess of Weight.” Standardization of Technical Terminology: Principles and Practice. ASTM. 2: 45-48.Hodgman, Charles D., editor. (1961). Handbook of Chemistry and Physics(44th ed.). Chemical Rubber Co. 3480-3485.Knight, Randall Dewey (2004). Physics for Scientists and Engineers: a Strategic Approach. Pearson.Weight is a measure of force that is equal to the gravitational pull on an object. Weight depends on location. Units can be multiplied and divided to generate new units for quantities like the liter for volume.
Ammonium Chloride is a compound with the chemical formula NH4Cl, having a molecular weight of 53.49 g. It is highly soluble in water, with a solubility of 370 g/L at 20°C. AI generated definition based on: UV-Visible Spectrophotometry of Water and Wastewater (Second Edition), 2017
Sep 17, 2024 · Ammonium chloride is a white crystalline salt with the chemical formula NH₄Cl. It is composed of ammonia (NH₃) and hydrochloric acid (HCl). This compound is commonly used in fertilizers, as an electrolyte in dry cell batteries, and in various industrial applications.
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What is the melting point of NH4Cl?
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What is the equilibrium pH of NH3 / NH4+?
What is saturated aqueous ammonium chloride (sat AQ NH4Cl)?
How does ammonium chloride form a crystalline structure?
Molecular Weight: 53.49 g/mol. Appearance: White crystalline solid. Chemical Formula: NH4Cl. Melting Point: 338 C (sublimes) Acidity (Pka): 9.24. Ammonium chloride (NH4Cl) is a solid that is often used as a source of ammonia for reactions such as amide couplings. NH4Cl solutions are mildly acidic.
