how to find the molarity of unknown acid using millimoles of H and OH
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To calculate the molarity of the unknown NaOH solution you will need to follow the example in Figure 6 (provided below for reference but note that it is a different reaction altogether!). Show your work below using the Math Editor. (Be sure to include units on each number and round the answer to the correct number of significant figures at the end) NOTE: You will need to know: the balanced chemical equation, the volume of H2SO4 you put into the Erlenmeyer flask (using the graduated cylinder), the concentration of the H2SO4 solution (found on the carboy in the hood), the amount of the unknown NaOH solution it took to neutralize the solution. Figure 6: Finding an Unknown Molarity from a Known Molarity. Example Question: Given the following equation: 3 KOH (aq) + 1 H3PO4(aq) -> 1 K3PO4(aq) + H2O (aq) What is the M of a KOH solution if it took 17.2 mL of a 1.7M solution of H3PO4 to neutralize 10.0mL of the KOH? Answer: 17.2 mL H3PO4 | 1 L H3PO4 / 1000mL | 1.7 mol H3PO4 / 1 L H3PO4 | 3 mol KOH / 1 mol H3PO4 = 0.088 mol KOH in 10.0mL = 8.8M KOH
Adi S.
Determine the volumes of NaOH and acid for trial 3. (see Part 2. Step 13) DATA TABLE UNKNOWN LETTER: D Trial | Volume NaOH (mL) | Volume acid (mL) | Minimum temperature (°C) | Maximum temperature (°C) | Temperature change (°C) 1 | 30.0 mL | 30.0 mL | 21.4 °C | 28.1 ° | 6.7 °C 2 | 40.0 mL | 20.0 mL | 21.3 °C | 30.8 °C | 9.5 °C 3 | 45.0 mL | 15.0 mL | 21.1 C | 27.5 | 6.4 °C DATA ANALYSIS 1. Use your data to determine the whole number mole ratio of moles of NaOH to moles of unknown acid. 2. Is the unknown acid monoprotic, diprotic, or triprotic? Explain your answer. 3. Determine the identity of the acid (HCl, H2SO4, or H3PO4) from your data. Write the actual balanced chemical equation for the reaction between the acid and sodium hydroxide. Hint: your products are going to be water and an ionic compound. 4. Which solution was the limiting reactant in each trial? Explain your answer with words or calculations.
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