When a 15.5 mL sample of a 0.407 M aqueous nitrous acid solution is titrated with a 0.329 M aqueous sodium hydroxide solution, what is the pH after 28.8 mL of sodium hydroxide have been added? pH =
States of Matter
The substance that constitutes everything in the universe is known as matter. Matter comprises atoms which in turn are composed of electrons, protons, and neutrons. Different atoms combine together to give rise to molecules that act as a foundation for all kinds of substances. There are five states of matter based on their energies of attraction, namely solid, liquid, gases, plasma, and BEC (Bose-Einstein condensates).
Chemical Reactions and Equations
When a chemical species is transformed into another chemical species it is said to have undergone a chemical reaction. It consists of breaking existing bonds and forming new bonds by changing the position of electrons. These reactions are best explained using a chemical equation.
Nitrous acid is HNO2, a weak monoprotic acid with Ka = 6.92*10-4 (pKa = 3.16).
Sodium hydroxide is NaOH, a strong monoacidic base.
The balanced equation for the neutralization reaction is:
HNO2(aq) + NaOH(aq) NO2-(aq) + H2O(l) +Na+(aq)
Since all the coefficients are 1, the required mole ratio is 1/1
Hence equal moles of HNO2(aq) and NaOH(aq) and the reactant with a smaller mole is the limiting reactant.
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