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In addition, the carbon dioxide that is naturally dissolved in water further changes the basicity of the solution. a) Would the calculated molar mass be too high or too low if your standardized NaOH were exposed to air for a long period of time after the standardization? moles of acid, which means a lower molar mass. When it is exposed to the air, the concentration would increase because it would mix with other elements that are found in the air. Yahoo fa parte del gruppo Verizon Media. Keep the solution for at least an hour and then carry out the standardization. B. the molar mass would be too low because it would have a lower volume Noi e i nostri partner memorizzeremo e/o accederemo ai dati sul tuo dispositivo attraverso l'uso di cookie e tecnologie simili, per mostrare annunci e contenuti personalizzati, per la misurazione di annunci e contenuti, per l'analisi dei segmenti di pubblico e per lo sviluppo dei prodotti. Dissolve in 75 ml of carbon dioxide free water. The NaOH solution would, react with carbon dioxide from the atmosphere, which would result in a lower concentration, of NaOH than before. the solution produce. Titrating to find the molar mass of an unknown acid. The calculations would result in a similar molar mass. 4.000 g is after all 0.1000 mole of NaOH, so dissolving it in one litre of water should produce a one litre solution. Per saperne di più su come utilizziamo i tuoi dati, consulta la nostra Informativa sulla privacy e la nostra Informativa sui cookie. Thus, the actual concentration of the NaOH solution has to be determined experimentally using a process called standardization. A.How would your calculated molarity of the NaOH solution be affected (too high, too low, no change) by each of the following errors? You would calculate a larger number of moles of acid, and. If the NaOH was, exposed to air before the standardization of NaOH, then you would be able to calculate an, accurate number for the concentration of NaOH. NaOH molar solutions always have to be standardized before you can use them in a titration. solution was not exposed to air. 2. Course Hero is not sponsored or endorsed by any college or university. 3. Consider the effect of exposing the NaOH solution to the air. since molar mass is g/mol, a larger number of moles would result in a lower molar mass. 2. A The calculated molar mass would be too low if the standardized NaOH solution, A. However, the solid NaOH is hygroscopic (easily absorb moisture from air.) A larger volume of NaOH will be. The volume of the acid is not important.   Terms. Sodium Hydroxide Solution Standardization. San Diego State University • CHEMISTRY 200, Copyright © 2020. Course Hero, Inc. Since this time of exposure occurred after the standardization, you, would still be using the concentration calculated before. The most important value for the acid is, If the buret had been rinsed with deionized water and then filled with NaOH solution, without having been rinsed with the NaOH solution first, the calculated molar mass would, be lower. The NaOH solution would react with carbon dioxide from the atmosphere, which would result in a lower concentration of NaOH than before. Add 2 drops of phenolphthalein indicator. The calculated molar mass would be too low if the standardized NaOH solution were, exposed to air for a long period of time after the standardization. Per consentire a Verizon Media e ai suoi partner di trattare i tuoi dati, seleziona 'Accetto' oppure seleziona 'Gestisci impostazioni' per ulteriori informazioni e per gestire le tue preferenze in merito, tra cui negare ai partner di Verizon Media l'autorizzazione a trattare i tuoi dati personali per i loro legittimi interessi. The buret is rinsed with water, but not NaOH solution before it is filled. 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