Calcium carbonate Definition and 18 Threads

Homework Statement Calcium carbonate primarily occurs as two crystalline forms, calcite and aragonite. The value of∆!° for the transition CaCO3(calcite) ⇌ CaCO3(aragonite) is +1.04 kJ·mol-1 at 25°C. At that temperature the density for calcite is 2.710 g·cm-3, and that of aragonite is 2.930...

Hello guys, I have another question for you that I am stressing myself over, I would value your insights. Thanks in advance. When you add lime (Calcium carbonate) to clay soil it flocculates it and improves the structure, how does this happen ?

I have noticed that most castable refractories effervesce if mixed with acid. In context, this is orthophosphoric acid added to promote the formation of a calcium-aluminium phosphate bonding phase. In one case, I estimated that 40% of the calcium aluminate cement had become carbonated by...

Hi, I'm wondering if an aqueous solution of Calcium Bicarbonate and Ammonia would react to form Ammonium Bicarbonate and Calcium Hydroxide. Additionally, would Calcium Carbonate react with Ammonia in solution to form Ammonium Carbonate? EJ

Hello everyone, I would really appreciate your help on figuring out the issue of undesirable CO2 production in this situation. Homework Statement In a mixture of CaCO3 + CaHPO4; I am observing undesirable CO2 production under conditions of 20-25°C (room temp) and an undesirable excess of...

Hello, here goes the problem: The mass of calcium carbonate upon thermal decomposition decreased by 1/5. (a) How many molecules of CaCO3 per 100 molecules were decomposed to CaO and CO2. (b) The content of CaO in the final sample express in molar fraction. My solution: I set the starting...

In general, we heat CaCO3 to temperature of approximately 825°C it decomposes into calcium oxide and liberates carbon dioxide gas: CaCO3 →825°C→ CaO + CO2 Is it possible to heat the calcium carbonate at temperatures below 825 degrees Celsius, so the decomposition into calcium oxide.

Hello Everyone, I am working with CaCO3. I want to have the precipitated CaCO3 in the laboratory. The easy way is to mix Na2CO3 and CaCl2. It gives CaCO3 and NaCl but this reaction takes place in a flash. As the reaction rate is high the produced CaCO3 forms powder like substance (the syze of...

I was trying to calcine some CaCO3 (Calcium Carbonate), but ended up with Calcium Hydroxide. To test if I had Calcium Carbonate I added it to some vinegar, no gas was produced. I then mixed in a small amount of the powder with a large amount of water and passed CO2 through it, and it became a...

Calcium carbonate sample --> calcite or aragonite? Is there a definite way to determine whether a calcium carbonate sample is calcite or aragonite? The weak bond of aragonite should produce an active reaction with a weak acid such as diluted acetic (vinegar), whereas calcite will require a...

Homework Statement Calcium carbonate (\mathrm{CaCO_3}) has two common crystal forms: Calcite and Aragonite. In room temperature and atmospheric pressure, the Calcite has Gibbs energy -1128.8 kJ/mol, volume 36.93 cm^3/mol and entropy 92.9 J/K/mol, and the Aragonite has Gibbs energy -1127.8...

Hi What is the reaction of calcium carbonate and water. I thought it was insoluble but I was looking up some notes from a chemistry practical i did and it says CaCO3(s) + H2O (l) → Ca(OH)2(s) + CO2(g) Can someone please explain this reaction for me as I can't find it on the internet...

How do u derive a general formula (without undue approximations) to calculate the solubility of CaCO3(s) in a aqueous solution at any pH? Thanks

I was told to design an experiment and run it during my chemistry lab period, and I came up with the following idea: Soil usually is limed with calcium carbonate containing products (agricultural lime) in order to raise the pH of the solution. Thus, I first isolated the amount of calcium from...

Thank you in advance for the correction of the resolution. Homework Statement By reacting 225 g of hydrochloric acid with 300 g of calcium carbonate with 80% of purity, 34 L (litres) of gas were obtained, measured at 37oC and a pression of 0.82 atm. What is the yield of this reaction and what...

Caffeine & Dichloromethane What are the products of caffeine & dichloromethane? I think caffeine is acting as the acid, and dichloromethane as the base. So, the caffeine is releasing H+ into the solution. So would the equation be: C8H10O2N4 + CH2Cl2 --> C8H9O2N4+ + (I have no...

Calcium Carbonate is heated in a closed vessel, and an equilibrium is reached. CaCO3 (s) <=> CaO(s) + CO2 (g) At 500 C the equilibrium pressure of carbon dioxide is 1.2*10^-3 atm and at 1000 C it is 3.87 atm. what is the equilibrium constant for this reaction at 500 C? :confused:

what experiment should i conduct to compare the amounts of calcium carbonate in 2 different shells... i believe this might be of use: acid + carbonate = salt + water + carbon dioxide my email is janice_ling88@yahoo.com.sg