When 1.00g of an impure powdered sample of dolomite was completely dissolved in excess warm dilute hydrochloric acid, 0.44g of carbon dioxide is evolved . What is the percentage purity of the dolomite sample? Can you please explain the reactions taking place?
1 g of dolomite produced 0.44g CO2. first of all i would need the formula of dolomite. CaMg[CO3]2 or calcium magnesium carbonate placing dolomite in with HCl is doing 2 things: forming the metallic salt and carbon dioxide CaMg(CO3)2 + HCL -- CaCl2 + CO2 + H2O + MgCl2 1. you need to know ALL of the products 2. you need to know the balanced equation of the reaction 3. from the balanced equation, you can determine how much CO2 can be produced from PURE dolomite. if you only got 0.44g CO2, this is a percentage of what you would expect. therefore, this is a percent yield problem.
you have to buy a lot more equipment. you'll have to have a protein skimmer, and a bacteria haven in the gravel. you can only use real rocks because the plastic leeches into the water and saltwater fish are much more delicate than freshwater and they can't handle the impurity. you have to use special sea salt - not table salt - which you can get from most pet stores. the best preson to ask would be someone who owns a private pet store. they can talk to you about what you need, and how much it costs. it also helps if you can get your water from an established saltwater tank because then you'll get the microbes and bacteria ready to go and wont have to wait the month or two for your water to balance itself.
Do you mean make fresh from salt water? Otherwise you'd just add salt to the fresh water. LOL. If you meant fresh from salt water then here's how: You have to boil it from a closed container. The first container with the saltwater will send the steam upward where you need a pipe that is an upside down U shape. that way the steam travels up the pipe and condenses. the condensation will drip downward into another container and it will collect. The salt will stay in the 1rst container, and the pure water will collect in the second container, and that's how to do it!
Excess HCl means that you need to assume that the reaction between the dolomite and HCl was complete. So once you do all the calculations, you should find out that 0.64g of CO2 was meant to be released, something like that. Then make a percentage of (Gas Released) / (Gas That Should Have Been Released) et voila! Percentage purity of dolomite sample.
