0
Why should the solution in the polystyrene cup be stirred after each addition of acid?
Wiki User
∙ 6y ago
Stirring the solution in a polystyrene cup after each addition of acid serves several important purposes:
Homogeneity: Stirring ensures that the acid is uniformly distributed throughout the solution. This helps in achieving a consistent reaction throughout the entire volume of the solution.
Even Reaction: The chemical reaction between the added acid and the solution's components relies on the contact between reactants. Stirring enhances the mixing of reactants, promoting a more even and efficient reaction.
Temperature Distribution: The reaction between an acid and a solution can be exothermic, meaning it releases heat. Stirring helps distribute this heat uniformly, preventing localized hotspots that could affect the reaction rate or lead to inaccurate measurements.
Accurate Measurements: When conducting experiments, particularly in laboratories, precise control over the reaction is essential. Stirring helps ensure that the reaction progresses consistently, aiding in accurate measurement of the amount of acid added and the resulting changes in the solution.
Faster Reaction: Stirring can accelerate the reaction kinetics by increasing the frequency of collisions between reacting molecules. This is crucial for reactions that might be slow or require efficient mixing for optimal results
Sakhi Nazar Farzam
Add your answer:
Earn +20 pts
Why should a thermometer not touch the sides of the test tube and should be placed in the middle?
If you place the thermometer so it touches the sides of the test tube, you are measuring the temperature of the test tube, not the substance in the test tube. So, in order to get an accurate reading of the substance, do not touch the sides of the test tube with the thermometer.
Why wait 10-15 seconds after dispensing a volume of titrant before a reading is made?
It takes a little time for all the molecules in the solution to reach equlibrium. For this reason there is a default time period you should wait to take your reading. You can shorten the time a little if your solution is being stirred but just keep it consistent for each reading. Your teacher or lab proctor probably just like 10-15 seconds.
What color is Lugol's solution prior to changing color?
Lugol's solution is a solution of iodine (1-5%) and potassium iodide in water. So the solution should have the pale color of iodine and the color should be pale (light) brown.
Why acetic acid is used in copper sulphate assay by iodometry method?
For the best results reaction should take place in the slightly acidic solution (pH around 4-5), correct pH is obtained by addition of acetic acid.
Why should only freshly prepared solution of ferrous sulphate solution be used?
baking soda
What should be stirred with a red hot poker?
Fire
Should polystyrene be installed under concrete?
yes, as a moisture barrier
What should the nose cone on a rocket be made out of?
Molded polystyrene is best. Carved and sanded balsa wood is good
Why should you use polystyrene and thermalplastic to make ear defenders?
it blocks out sound.
Is it true that a solute dissolves faster when stirred into a solution because the pressure is moved away from its surface at a faster rate?
This is at least an unproven theory (or should I say 'feeling' or 'fantasy').So as long as this stands I'd say NO.
Is it harmful to eat styrofoam?
You should not eat plastics- including expanded polystyrene (styrafoam)
Should food be stirred every thirty seconds while cooking in microwave oven?
no
What is the heat capacity of a plastic cup?
Polystyrene (foam): -0.04 oC/sec weights of polystyrene cup: 113.8g thickness of polystyrene cup: 0.1mm
What resin Should you use on polystyrene to make it hard?
I could be wrong, but No resin is needed to make Polystyrene hard.Polystyrene is a thermoplastic substance, which is in solid (glassy) state at room temperature, but flows if heated above its glass transition temperature (for molding or extrusion), and becoming solid again when cooling off.source: http://en.wikipedia.org/wiki/Polystyrene
Why should a thermometer not touch the sides of the test tube and should be placed in the middle?
If you place the thermometer so it touches the sides of the test tube, you are measuring the temperature of the test tube, not the substance in the test tube. So, in order to get an accurate reading of the substance, do not touch the sides of the test tube with the thermometer.
Why does polystyrene melt when in contact with plastic electrical cable insulation?
AnswerIsn't polystyrene commonly known as "styrofoam" ?If so, why is it coming in contact with electrical wiring?In any event, if the polystyrene is melting, the wiring may be overloaded or has a hotspot due to a failure. The wire may be getting hotter than it should be.I am not aware of any chemical reaction that would occur if the two plastics touch each other at room temperature.I am:-Polystyrene is commonly used in loft and wall insulation, just the places that cables are run. The plasticisers used to make the PVC insulation on the cables flexible reacts with the polystyrene resulting in the polystyrene appearing to 'melt' and the plasticiser migrates out of the cable making it brittle and causing the insulating properties to break down. The cable will eventually fail, especially if disturbed and this is both a fire and electrocution risk.There is the added problem that the cables will get hotter due to the thermal insulation properties of the polystyrene preventing the cable from losing heat. If this hasn't been allowed for in the design of the circuit it too could be a fire hazard.The wiring regulations (BS7671 section 522.5.3) prohibits contact between PVC cables and polystyrene, but this is a common problem. An electrical engineer (or most electricians) can do a periodic inspection of your wiring system that includes insulation tests that will identify failed or failing cables. The only solution is to replace damaged cables and reroute them or provide conduit to protect them.PS Styrofoam is, I believe, an American brand name for polystyrene often associated with disposable coffee cups and similar products.
Should there be a solution to hot tap water scalding?
There should be, and there is. Turn down the thermostat on the water heater to no more than 120° F (49° C). There is no need for it to be any warmer, even if you have a dishwasher, and in addition to eliminating scalding you will save energy.
