Thus, about 0.002 moles, or 0.4 g, of KHPh is needed. At the endpoint, the number of moles of NaOH equals the number of moles of KHPh used: MNaOH = moles KHPh Eq. 2 VNaOH in liters or MNaOH = g, KHPh x 1000 mL/L Eq. 3 204.23 g/mole mL, NaOH Once the NaOH solution has been standardized, it can be used to determine the acid neutralizing capacity of an antacid tablet.
Exercise 1 1. Suppose a household product label says it contains sodium hydrogen carbonate (sodium bicarbonate). Using your results from Data Table 1 as a guide, how would you test this material for the presence of sodium bicarbonate? B BoldI ItalicsU Underline Bulleted list Numbered list Superscript Subscript33 Words
In this test, primary halides precipitate the fastest while secondary halides need to be heated in order for a reaction to occur. Comparison of the rates of precipitation of the obtained product to standard 1° and 2° bromide solutions will show whether the product is a primary or secondary
Title : Determination of chemical formula of hydrate Aim To determine the chemical formula of hydrated Copper (II) sulphate, CuSO4 Research Background “When the chemical is heated the hydrate will convert to an anhydrous ionic compound (this means the water will leave it). The moles of H2O will be determined by assuming the amount of mass lost by heating is the mass of the evaporated H2O. The moles of the CuSO4 (the white substance after heating) can be calculated from the mass of the white crystals. Using the molar ratio of moles of CuSO4 to moles of H2O, one can determine the chemical formula of the hydrate.” Apparatus and materials Apparatus and Materials used Quantity Crucible and lid
One mole of Ammonium dichromate will give rise to one mole of 1 mole of Chromium (III) oxide and 1 mole of Nitrogen gas and 4 moles of Water is gaseous phase. To convert these into formula units, 1 mole of any compound will equal 6.022X1023. So based on this, 1 mole of Ammonium dichromate is 6.022X1023 formula units. 1 mole of Chromium (III) oxide is 6.022X1023
Similarly, NaOH deprotonated the organic acid to form a polar water soluble conjugate base. When HCl was added to neutralize the solution, the conjugate base was reprotonated, and the largely insoluble organic acid precipitated out. Sodium sulfate crystals were added to the neutral compound in the organic solvent, because of their hygroscopic property, in order to remove all water from the ethyl acetate solution. The crystals were then filtered out using a piece of cotton with a glass funnel, which ideally trapped and removed all sodium sulfate
The HPLC method was applied to the solutions and the results obtained were shown in table 4.6.11. System suitability solution: 25.0 µg/mL each of of USP Amoxicillin RS in Diluent. Precision
2.2 Chemicals and reagents The API of AN (99.9% pure) 1000mg was purchased from market. HPLC grade acetonitrile (SD fine limited). Analytical grade hydrochloric acid ,sodium hydroxide flakes, hydrogen peroxide. Milli-Q Water purchased from market.. 2.3 Details of Method Chromatographic conditions: Reversed Phase High Performance liquid chromatography method with UV detection separation was achieved on zorbox Agilent Eclipsc XDB column c18(150 nm× 4.6 mm×5µm) as stationary phase with binary gradient mode solvent phase A. Composed of H3PO4(ortho phosphoric acid ) buffer ( pH ≈2, 0.02M) and phase B as Acetonitrile ,The Flow rate of the mobile phase was 1.0 mL/min and the total elution time including the column re-equilibration was approximately
n=cV n=1.00 mol dm^(-3)×(25 dm^3±0.16%)/1000=0.025 mol±0.16 % The enthalpy of neutralization is then calculated. ∆H=(-1356.5 J±3.104% )/(0.025 mol±0.16%)=-54260 J 〖mol〗^(-1)±3.3 % ∆H=-54260 J m〖ol〗^(-1)±3.3%÷1000=-54 kJ 〖mol〗^(-1)±3.3 %
The water percent is determined to be 42.06%. To find a percent error, a theoretical percent water must be used. To find the theoretical percent error divide the mass of water by the mass of magnesium sulfate heptahydrate and multiply by 100 to get a percent. The theoretical percent water is
Purpose The purpose of this experiment was to evaluate the stoichiometric relationship between the testing agents and 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. Introduction Procedure Phosphoric acid solution with a volume of 1.00 mL and a molarity of 6.00 M was transferred into a 125-mL Erlenmeyer flask using a volumetric pipette.
The control in the experiment is water. Units used while timing the productivity of gas from an Alka-Seltzer tablet in different temperatures is, seconds. In order to find out if temperature controls the rate of chemical reaction, whether hot water is a more effective way to make the gas produce at a faster speed, it would be necessary to compare the results of different temperatures at the end of each trial. In order to do this the scientists will measure the volume of gas that is produced within a 10 second interval time after the tablet begins to react.
The first consists to heat a sample to liberate the water hydration, and then compare two mass weights before and after heating so gets easier to find the water percentage (mass). Second step consists in chemical processes with the sample that drives to determine the percentage of the other element. Materials and chemical
AP Chemistry Semester 1 Final Review 2016 Basics of Chemistry: Name the following compounds BO3 H2S NaOH OF8 PCl6 HNO3 HgNO2 Write the formula for each compound Pentaboron triselenide Sulfuric Acid Carbon Monoxide Lithium Chloride How many moles are in 58.6 g of AgNO3 How many grams are in 2.5 moles of Cl2
The original use for obsidian, or volcanic glass, was for making chipped stone tools. Archaeologists soon found an incredible use for the tool that has helped us further our knowledge of the past. Obsidian hydration dating was first introduced to the archaeological community by the two geologists, Irving Friedman and Robert Smith, in 1960 (Hughes, 1993). The two ways this method can be used are relative dating and absolute dating. The relative dating method allows you to determine whether an artifact is older or younger than another, while the absolute dating method allows for a calendar date to be produced.