Lab Final Flashcards
Formula for density?
(Density Lab)
Mass (g)/volume (mL)
Standard deviation formula?
square root of (trial-average + etc)^2/n
Percent water in hydrate? (Hydrate Lab)
Mass of water removed/mass of unknown hydrate sample * 100
Moles H2O in sample? (Hydrate Lab)
Mass water (g) * 1 mol/18.02 g H2O
If the hydrate sample was not heated long enough to remove all water; what happens to the percent mass of water? Is it too high? Too low? (Hydrates Lab)
Percent mass of water would be too low because water would not have enough time to leave the hydrate.
If some of the hydrate sample was ejected from test tube how would this affect calculated percent mass water in the hydrate?
Percent mass of water would be too high because the ejected hydrate sample would be recorded as a loss of water.
What conductivity (us/cm) is considered a non-electrolyte, weak electrolyte, and strong electrolyte?
Single digit: non-electrolyte
80-300: weak electrolyte
1000’s: strong electrolyte
What ph is considered a weak acid, strong acid, neutral, weak base, and weak acid?
1-3: strong acid
4-6: weak acid
7: neutral
8–9: weak base
10-14: strong base
Molarity formula? (Titrations Lab)
M = mol/L
Percent error formula?
Absolute value of (observed-expected)/(expected) * 100
If the concentration of NaOH solution was 0.5 instead of 0.1 would the titration require more or less NAOH for a complete reaction? (Titrations Lab)
It would require less. The higher the concentration, the less volume needed.
What is the limiting reactant in the ideal gas law lab?
Magnesium. The reaction stops when the magnesium dissolves.
If an air bubble became trapped and increased the volume, how would R be affected? (Ideal Gas Lab)
The volume would be larger.
How to find the enthalpy of a solution? (Constant pressure calorimetry lab)
Qrxn= -mC🔺T
🔺Hsolution= Qrxn/moles salt
How to find specific heat if metal? (Constant pressure calorimetry lab)
MC🔺T = MC🔺T
C = MC🔺T/M🔺T
