The purpose of this experiment was to prepare and standardize a sodium hydroxide solution as well as determine the molar concentration in as strong acid and the percent by mass of acetic acid in vinegar. We used volumetric analysis, also known as titration, in both experiments. The average molar concentration for NaOH was 0.2749 mol/L while the average molar concentration of the acid solution was .2493 mol/L.The average percent by mass of acetic acid in vinegar was found to be 12.3 %
The Purpose of experiment 9 was to prepare and standardize a sodium hydroxide solution as well as determine the molar concentration of a strong acid. The purpose of experiment 10 was to use what we learn in experiment 9 in order to determine the percent by mass of acetic acid in vinegar. Learning Volumetric Analysis is important and relevant to science because it helps determine concentrations of unknown substances. Due to the fact that sodium hydroxide is extremely hygroscopic, as a solid it mass cannot be measured with a primary standard solution also known as an accurate molar concentration. To solve this we have to standardize the Sodium hydroxide solution with an acid. In order to determine the molar concentration of…
very high pH of 12, it can be predicted that sample number 2 is the oven cleaner that contains Sodium Hydroxide. Sodium Hydroxide (NaOH) is highly corrosive due to its elements; the presence of oxygen and an electrolyte (Sodium – Na) cause corrosion, the breakdown of a metal resulting from reactions with chemicals in its environment. The oxygen oxidizes with the metal, and the sodium help speed up the corrosion process. The presence of oxygen and electrolytes (Sodium – Na) in sample number 2…
Titrating Vinegar with Sodium Hydroxide (NaOH)
Acids are anions that have at least one hydrogen cation tacked onto their molecular formulas. The Bronsted definition of an acid states that acid is a proton, H+, donor.3 Acids can fall into one of two categories: they can be strong or weak. Strong acids completely dissociate their H+ and weak acids only partially dissociate their H+.3 This means that a strong acid cannot return to its initial state once it undergoes a reaction. On the…
experiment, a titration was carried out using a standard solution of hydrochloric acid to establish the molarity of a solution of sodium hydroxide. The concentration of acid in the gastric juice sample was determined using that solution of sodium hydroxide. The pH of gastric juice was then calculated and compared with the value determined by…
The Case of the Mix-Matched Chemicals
Hypothesis: By measuring the pH of the unknown and known chemicals, the types of chemicals in the unknown bottles will become known.
Purpose: The purpose of this experiment is to determine the type of chemicals that are inside the mislabeled bottles.
• pH strips
• 8 bottles of known chemicals:
o silver nitrate
o iron (III) nitrate
o copper (II) nitrate
o sodium iodine
o sodium hydroxide
o nitric acid
o lead (II) nitrate
unknown acid solution (90 mL) and three 250 mL beakers. Make sure the beakers are clean.
• Acquire 0.1 M of NaOH solution for this experiment and make sure to determine the specific molar concentration of sodium hydroxide utilized.
• Obtain a buret and make sure to rinse it with tap water, deionized…
The unknown base concentration of a sodium hydroxide solution can be determined by titration potassium hydrogen phthalate (KHP) with an unknown concentration of sodium hydroxide NaOH. The average molarity of NaOH determine by the moles and volume of the KHP and NaOH. (Eq 1).
KHC8H4O4(aq) + NaOH(aq) = H2O(l) + NaKC8H4O4(aq) (Eq 1)
The unknown concentration of white vinegar can be determined by the white vinegar with the known concentration of…
used as the primary acid standard to determine the molar concentration of the sodium hydroxide solution in part one of the experiment. It was known that the potassium hydrogen phthalate and sodium hydroxide should have had a 1:1 stoichiometric molar ratio. Potassium hydrogen phthalate was used as the primary standard because it is a very pure concentrated substance that can be predicted. However, the sodium hydroxide is too difficult to be measured because of its tendency to absorb water vapor.…
to identify the products formed. The relationship was found by completing three acid and base neutralization reactions using phosphoric acid, which is a triprotic acid, with different volumes of sodium hydroxide.
When looking at the coefficient of balanced equations, stoichiometry is seen. Coefficients represent the number of moles, equivalent to the mass of an atom, of the products and reactants. Stoichiometry was demonstrated in this experiment to determine the relationship…