कक्ष 13 मधील व्यक्तीस खोली 4 मधून बाहेर पडायचे आहे.. त्या दरम्यान त्याला प्रत्येक खोली मधील व्यक्तीला भेटायचे आहे.. कोणत्याही खोलीत तो पुन्हा जाणार नाही
Answers
Step-by-step explanation:
Long story short: When an acid is dissolved into water, it produces H₃O⁺ ions. When a base is dissolved into water, it produces OH⁻ ions. pH is a measure of the concentration of the H₃O⁺ ions; that is, how many H₃O⁺ molecules there are in the solution, divided by the volume of the solution. This concentration, or [H₃O⁺], is equal to the number of moles of H₃O⁺ molecules (which is a measure of the total number of molecules) over the volume. The value of the pH is given as follows: pH = -log([H₃O⁺]), where log() is the base ten logarithm. Similarly, pOH is the exact same thing but measuring the concentration of the OH⁻ ions, and thus pOH = -log([OH⁻]). The pH and pOH values are related in a manner that depends on the temperature of the solution. At 25°C, pH + pOH = 14. Because water is neutral and therefore contains an equal concentration of H₃O⁺ and OH⁻ ions, we find that pH = pOH = 7 at 25°C. In water, these ions are produced by the water molecules themselves as follows:
H₂O + H₂O⇌H₃O⁺ + OH⁻. The "⇌" symbol signifies a reaction that goes both ways, that is, both the H₂O's react to give H₃O⁺ and OH⁻, and the H₃O⁺ and OH⁻ react to give H₂O's. The reaction is practically finished when the solution reaches an equilibrium where both opposite reactions happen at the same rate so nothing really changes: whatever quantity is produced is at the same time consumed.