Indicator is used to detect the end point of a titration by visual change of color. Indicators can be acid base indicator, precipitation titration indicator and redox indicators.
An acid base indicator shows different colors in acidic and basic media. So, in the absence of an acid base indicator the equivalence point can be determined by monitoring the changes in pH as the acid-base titration proceeds.
A precipitation indicator forms colored precipitate at the end point. In the absence of such indicators, the point where the formation of the precipitate just starts to take place is taken as the end point.
In a redox titration, the indicator used shows different colors in acidic and basic media. In the absence of redox indicator, usually one of the solution being titrated acts as a self indicator, like permanganate solution. So, there will not be any need to add an external indicator in such cases.
The answer is the first one because the sodium is the first element of the third row, thus 3s^1
Answer:
The average atomic mass of an element is the sum of the masses of its isotopes, each multiplied by its natural abundance (the decimal associated with percent of atoms of that element that are of a given isotopе). An element does not have an absolute atomic mass.
<em>Hope</em><em> this</em><em> </em><em>helps</em><em> </em><em>:</em><em>)</em>
The magnetic quantum
number <span>is one of four quantum numbers which are
assigned to each electron in an atom to describe that electron's
state.
The magnetic quantum number (ml) can be any
integer between -l and +l.
Magnetic quantum number specify orientation of electrons in magnetic
field and number of electron states (orbitals) in subshells.
Magnetic quantum number (ml) specifies the orientation in space of an orbital
of a given energy and shape . Magnetic quantum number divides the subshell
into individual orbitals which hold the electrons, there are 2l+1 orbitals in
each subshell.
For 5p orbital electrons:
Principal quantum n = 5.
Angular quantum number l = 1.
<span>Magnetic quantum number ml = -1, 0, +1.</span></span>
Answer:
That's easier for you to come over and watch the answer to the question