1. S

    Why is heat produced/released when we add water (H2O) to calcium oxide (CaO)?

    Why is heat produced/released when we add water (H2O) to calcium oxide (CaO)?
  2. I

    Why is the current draw dropping in water electrolysis

    We've done an experiment regarding water electrolysis. Basically, we just separated the oxygen and hydrogen gas in a beaker that contains a magnesium sulfate solution. We set the power supply voltage to 12.46V with an initial .09A and final .01A over 45 mins. I was wondering as to what causes...
  3. M

    calculate alkalinity hardness of water

    the first part is ok help as from hydrogen ions
  4. T

    MgO in water and pH

    Is it possible to estimate the concentration/changes of MgO (or Mg(OH)2 dissolved in water by measuring the pH? By any chance, is there any graph of the MgO concentration as a function of pH?
  5. F

    What energy is there in water

    Hello What energy is there in 1 meter 3/seconds water if it flow
  6. F

    Why we boil coin in water

    Hello Why we boil coin in water
  7. K

    How to judge the drinkability of water whatever its nature

    I would like to design a system that allows to judge the potability of water after having made a certain number of measurements with the available sensors such as the PH sensor, turbidity, temperature, TDS meter... after some research I found that there are 8 essetial parameters that once...
  8. A

    Question about ammonia and TAN for a small experiment

    Hello! I am trying to set up a small experiment for my class but I am stuck on a problem. We have three saltwater tanks, with the following measurements: The first tank will have a pH of 7.5, an NH3 level of 0.06 mg/L, and a TAN (total ammonia nitrogen) level of 20. Just NH3 is added. The...
  9. B

    what definition of acid and base theory fits in potassium chloride + water reaction?

    We've been asked to identify the acid and base in KCl+H2O with appropriate acid-base definition and only the reactants are given. We've learnt the following theory in class, Arrhenius, Brønsted–Lowry,Solvent System, Lux-Flood, Lewis. I think the completed equation would be KCl+6H2O→K(H2 O)6]^+...
  10. D

    chlorination in aerated water

    I want to remove manganese (0.7 mg/l) by aearation, from well water in an plant in wich I have only chlorination sistem.Will the oxigen adition affect the action of cl2? On which point I should be careful? I want to make oxygenation in the same tank in witch i will make the chlorination. Would...
  11. A

    Why oil cannot get sprayed and dispersed while water can?

    Why oil cannot get sprayed and dispersed if it's put in glass cleaner sprayer and the spray knob is pressed, while the water will be? The knob would feel very hard if being pressed.
  12. E

    Water distillation question

    Hi chemistry Gurus, I am a farmer based in Australia who is trying to remove the following impurities from a water solution via distillation. Sodium Bisulphate Sodium Bicarbonate Sodium Carbonate Isocyanuric Acid Calcium Chloride Sodium Hypochlorite I know that by distilling the water...
  13. M

    What remains after water evaporates from sulfuric acid Solution

    Hi, I have a 5 gallon bucket that was 1/2 filled with an H2SO4 solution (15% by volume). The solution also had 6051 aluminum rod that was sitting inside. After sitting for several months, all of the water has evaporated and a portion of the aluminum tubing has corroded away. What is left...
  14. K

    Why is NH3 a base in water?

    The reaction of NH3 +H2O --> NH4 +OH. Since NH4 accepted a proton from water, it's a Bronsted Lowry base and and becomes a conjugate acid which is weak. I'm confused why did H20 in this case act as an acid and NH3 acts as a base, can someone please explain?
  15. D

    Sulfuric Acid + water

    Iv'e been doing some research for a personal project and iv'e hit a roadblock. what i would like to know is; what is the chemical composition of a mixture of sulfuric acid and water? after doing some research iv'e gotten two different answers. One is that simply a dilution of sulfuric acid will...
  16. R

    Breaking water molecule

    Hi, While a mere 1.3 volts can break bonds in a water molecule, I have been reading that it takes 2000-3000 degrees celsius to break same bonds thermally. Such high temperatures intuitively appear to be very high energy compared to 1.3 volts. Why does it take such high temperatures? How exactly...
  17. F

    H202 in drinking water

    Hello I am not studying chemistry, I hope someone can help me. My partner put hair color in the kitchen sink, I removed blobs of it with kitchen paper and just rinsed the sink with water. Later dishes soaked in the sink and then went in the dishwasher. I am worried that there will be a...
  18. T

    Formula for correcting ABV (Alcohol by volume)

    Hi, can anyone help me find formula, which would correct ABV, that is measured by alcoholmeter, which is calibrated for 20°C, but the mixture has different temperature? I want to implement this calculation into program so I can not use alcoholometric tables. I know this formula for density of...
  19. G

    Electrophilic addition of water using sulfuric acid catalyst mechanism?

    cant find the mechanism anywhere. this is the best idea i had. would greatly appriciate it if someone could verify it or show me the correct one.:)
  20. B

    will water evaporate?

    Hi everybody ! the question is will 100 mkL of water evaporate in 20 mL crimp top vial at 30% relative humidity, and normal conditions ? how to calculate it?