PH indicators detect the presence of H+ and OH-. They do this by reacting with H+ and OH-: they are themselves weak acids and bases. If an indicator is a weak acid and is coloured and its conjugate base has a different colour, deprotonation causes a colour change.
The entire mass of a black hole
Total pressure = 
= 0.78 + 0.21 + 2.67 * 10⁻¹⁶
<h3>
= 0.99 atm</h3><h3>What is pressure?</h3>
The force of all gas particle/wall collisions divided by the surface area of the wall is the definition of pressure (P): One of the fundamental quantifiable variables of this phase of matter, pressure, is a property shared by all gases.
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Answer: option C. NaCl + LiNO₃ ---> NaNO₃ + LiCl
Explanation:
1) An oxidation-reduction reaction is the oxidation of at least one element and the reduction of at least one element.
2) Oxidation is the increase of the oxidation number, due to the loss of electrons.
3) Reduction is the reduction of the oxidation number, due to the gain of electrons.
4) You can tell whenever a reaction is an oxidation-reduction by observing the oxidation numbers: if two elements changed its oxidation number (one increases and one reduces) it is an oxidation - reduction, else it is not.
5) Oxidation numbers:
i) NaCl
Na: 1+, Cl: 1-.
ii) LiNO₃
Li: 1+, N: 5+, O: 2-
iii) NaNO₃
Na: 1+, N: 5+, O: 2-
iv) LiCl
Li: 1+, Cl: 1-.
There you have that the oxidation numbers of the five elements (Na, N, O, Li, and Cl) remained unchanged.
None element was reduced and none element was oxidized, so you conclude that this is not an oxidation-reduction reaction.
