The reaction between NO and O2 is exothermic. Consider the reaction: CaCO3(s) CaO(s) + CO2 (g) Will the mass of CaCO3 at equilibrium increase, decrease or remain the same if (a) CO2 is added to the equilibrium system? INCREASE (b) the pressure is increased? INCREASE (c) solid CaO is removed? DECREASE 12. Moist - when water is added the equilibrium would shift left, making a higher equilibrium concentration of the pink compoundġ1. A weather indicator can be made with a hydrate of cobalt (II) chloride, which changes color as a result of the following reaction: Cl2 (s) Cl2 (s) +2H20(g)ĭoes a pink color indicate “moist” or “dry” air? Explain. What would be the effect on the equilibrium position of an equilibrium mixture of carbon, oxygen, and carbon monoxide if the total pressure of the system were decreased? 2C2 (s) +O2 (g) 2CO(g) RIGHT 10. What would be the effect on the equilibrium position of an equilibrium mixture of Br2, F2, and BrF5 if the total pressure of the system were decreased? 2BrF5(g) Br2(g) + 5F2 (g) RIGHT 9. In which direction would the equilibrium shift for the equation in 1f if heat were added? (the rxn is endothermic). In which direction would the equilibrium shift for the equation in 1e if CH3OH were removed? RIGHT 7. In which direction would the equilibrium shift for the equation in 1d if pressure were decreased? LEFT 6. In which direction would the equilibrium shift for the equation in 1c if O2 were removed? LEFT 5. In which direction would the equilibrium shift for the equation in 1b if N2O5 were added? RIGHT 4. In which direction would the equilibrium shift for the equation in 1a if S2 were removed from the reaction vessel? RIGHT 3. Since then the e-Gel has become a favourite for electrical departments as it has a strong colour indicating curve, copes well in harsh weather conditions and high-UV areas, and gets the green tick for being non-carcinogenic and more environmentally friendly.įor more information visit Daywalk.Equilibrium Problem Set #2 For each of the following reactions, describe what effect and increase in pressure would have on the equilibrium position of the reaction (i.e. The orange to green silica gel was offered and this then underwent a scrutinising process and trial, and it performed extremely satisfactorily for the customer. Not good!Īt that stage, one of the other alternatives were offered and by this stage as you can appreciate, the trust had been somewhat damaged through supplying the previous ‘unacceptable’ product. He was not happy with the style of colour change…from orange to a translucent white and he thought it might have even been affected by the UV rays.
COBALT CHLORIDE WEATHER INDICATOR STOPPED CHANGING COLORS TRIAL
The customer was absolutely clear that blue to pink was unacceptable to them, and so an alternative was offered: the orange to white silica gel.Ībout twelve weeks into the trial of the new product a very irate substation maintainer phoned up and complained about the new orange to white gel discolouring after only three months in the field. The initial response was …Certainly! We can supply you silica gel…it will be the blue to pink style. Some years ago, another large Power company had a difficulty in their supply chain for silica gel so they approached an alternative supplier, who stocked silica gel. The decision would have been somewhat based on the fact that the orange to green silica gel, also known as e-Gel, is more environmentally friendly, and is non-cobalt based, therefore the product is classed as non-carcinogenic. However, since that time that same organisation has migrated to using the non-cobalt based silica gel – and they have started to use the orange to green silica gel, which has the methyl violet as the indicator. One large organisation conducted extensive tests and the final report that was presented gave them peace of mind that it was still OK to use the blue to pink silica gel, in that while the cobalt chloride was present, the parts per million (ppm) was such a low number that they felt it was safe enough to continue using the conventional blue to pink silica gel. Certain organisations have done testing as to the safety of such products.
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