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5. 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.

          5. 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.

5. 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.

Added by Becky P.

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