To measure and prepare my standard solution accurately I had to find the correct mass to weigh on the balance. To ensure this I had to work out the number of moles by: Number of moles = Volume × Molarity 250cmᵌ was the volume of my alkali. However I was working in litres therefore my volume turned out to be 0.0250. I also know that my molarity is 0.1 so I can add this into my formula to work out the number of moles. Number of moles = 0.0250 ×
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Part A - Planning Student Brief This controlled assessment is about neutralisation reactions‚ which take place when an acid reacts with an alkali. Neutralisation reactions are exothermic‚ and the temperature rise depends on a number of factors‚ including: • • • the concentration of the acid or the alkali the volume of the acid or the alkali which acid and alkali are used. Write a plan that will allow you to find out about how a factor affects the temperature rise in neutralisation reactions. How
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the addition of the alkali. The results were recorded in a table. 20mL of an unknown sample was pipetted into a 100mL beaker. A burette was used to add 0.5mL aliquots of 0.1M NaOH and the pH was recorded from the pH meter. This procedure was repeated until pH of around 11 or 60mL of NaOH had been added with each 0.5mL aliquots being recorded. Results. Testing of the Henderson-Hasselbach equation The results in Table 1 reveal the effects on a buffer pH when an alkali solution is added.
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increasing atomic numbers Specific Areas and Their Properties * Alkali Metals – Group 1 Metals * Alkaline Earth Metals – Group 2 Metals * Transition Metals * Lanthanide Series – Rare Earth * Actinide Series – Rare Earth * Halogens – Group 17 * Noble Gases – Group 18 Families/Groups * Vertical columns on the periodic table * Properties of elements are similar when moving down a group * Family 1: (Alkali Metals) * One valence electron (gives up this electron
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The alkali will now have a concentration of 0.1 mol dm-3. • In the titration‚ the NaOH will be in the burette‚ and will be titrated into HCl in a conical flask: NaOH (aq) + HCl (aq) NaCl (aq) + H2O (l) • The reaction is 1:1 between NaOH and HCl‚ so a solution of 0.2 mol dm-3 should be used. • Rinse a 25cm3 pipette out with some of this solution‚ and then transfer 25cm3 of it to a clean conical flask. • Add 3 drops of phenolphthalein. • Wash a burette with some of the diluted alkali and then
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of our investigation was to identify and understand how different chemicals (Acids‚ alkalis and neutral) react and experience a change in colour due of this. Introduction: The red cabbage indicator shows how a usual household product such as red cabbage can make a suitable indicator and be able find out if a chemical is either and acid‚ alkali or neutral. Acids are a chemical that reacts with an alkali neutralising it producing water and a salt. Acids are also commonly found to be sour
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Chapter II Review of Related Literature Chemical Wood Pulping Chemical wood pulping involves the extraction of cellulose from wood by dissolving the lignin that binds the cellulose fibers together. The 4 processes principally used in chemical pulping are kraft‚ sulfite‚ neutral sulfite semichemical (NSSC)‚ and soda. The first 3 display the greatest potential for causing air pollution. The kraft process alone accounts for over 80 percent of the chemical pulp produced in the United States
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well as to learn some descriptive chemistry. Cations are Alkali and Alkaline earth metals group‚ they are quite easily excited to higher energy states such that the energy supplied is sufficient. Alkali and Alkaline earth metals are very reactive metals that do not occur freely in nature. To investigate or verify the above concept an experiment was conducted with the following objectives: (1) perform flame and confirmatory tests on alkali and alkaline earth ion and ion (III) ion (2) identify the
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plagioclase feldspar (oligoclase or andesine) and amphibole (usually hornblende) with various other minor minerals like pyroxene‚ biotite. Quartz and alkali feldspar may also be present. When the amount of quartz increases‚ the rock is named quartz diorite. The rock grades into granodiorite as the amount of quartz and alkali feldspar increases. Alkali feldspar increase. Some common accessory minerals are apatite‚ titanite and various iron oxides. Xenoliths from the partially melted margins of the
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and molecular structure. This shows periodicity in both the molecules and the individual atoms. Alkali metals contain a single electron in their outer shell rendering them highly reactive. This allows them to be ready to donate this single electron to form molecules with substances like water. Halogens are also extremely reactive containing seven electrons in their outer shell. Similar to alkali metals‚ halogens need only one electron in their outer shell to become stable. The reactivity of
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