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Q: When you ride a fast elevator upward you feel slightly heavier as the trip begins and slightly lighter as the trip ends How is this phenomenon related to the equivalence principle?
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Standardising HCl using Na2CO3 titration. textbook says the solution at the equivalence point is slightly acidic. is it and why?

it depends on the strength of the acid and base used: so, strong acid + strong base = neutral equivalence point strong acid + weak base = acidic equivalence point weak acid + strong base = basic equivalence point In this case, HCl is a strong acid, and Na2CO3 a weak base. Therefore, the equivalence point will be slightly acidic.


Which phenomenon takes first'Lightning'or' Thunder'?

Lightning occurs very slightly sooner, and causes thunder.


What the definition of internal noise?

phenomenon of repeated presentations of the same stimulus producing a range of slightly different internal representations


What is endpoint in titration?

The endpoint of a titration is when the indicator first changes in appearance, or when an instrument first gives a reading which indicates that the titration is finished. The endpoint is always slightly after the equivalence point.


Are you slightly longer while lying down than you are while standing up what physics principle is it demonstrating?

Are you slightly longer standing up verses laying down?


What happens to earth's oceans when the moon pulls on earth?

The oceans shift slightly with the moon's pull, which causes a phenomenon known as tides.


What is a dental root elevator?

it is a tool used by the dentist, that clamps around the base of the tooth, and is used to "raise" the tooth slightly so the dentist can get a good grip on it to extract it.


How do you use phenophthalein to test for acids and bases?

Any titration is done to find the "equivalence point" - where the amount of titrant (strong base in your question) is equal to the amount of unknown (weak acid in your question). When the two are equal, the base has converted all the weak acid into it's conjugate base. An indicator should change color over the pH range that includes the equivalence point. In your question, when using a weak acid, what's left at the equivalence point is a strong conjugate base. The solution will have a slightly basic pH. Phenolphthalein has a colorless to pink transition over the range of pH 8-9.6, which is slightly basic. So it changes color across the equivalence point. So it makes a good indicator for the scenario you asked about. Thymol blue (color change slightly lower pH, weaker base, stronger acid) or Thymolphthalein (color change slightly higher pH, stronger base, weaker acid) may also be good choices.


Do volcanoes think?

i would have thought so, but the scientific principle of the whole phenomenom is slightly unnerving. My friend bryn is coolio yah?


Are all Buddhism marriages arranged?

Arranged marriage is a cultural customary phenomenon. Religions often are modified slightly to fit the local cultures. Buddhism has nothing to do with arranged marriages.


Do objects in Earth's orbit appear to be weightless because they are in free fall?

Yes, exactly. A useful way to think of an object in orbit is that it is falling towards Earth much like anything else but, because of its velocity and distance from earth, it keeps missing the ground. This seems slightly contradictory -- a weightless object under the pull of gravity -- but it isn't, really. Suppose you're in an elevator that's had its cables cut. (Heaven, forefend!). Gravity accelerates you and the elevator Earthward at exactly the same rate, so you feel like you're floating relative to the elevator, but you and the elevator are just falling at the same rate.


Where in the bible is the scripture wisdom is the principle thing therefore get wisdom. In all thy getting get understanding?

See Proverbs 4:7. Translations vary slightly, but that's your verse.