A potential source of error for this lab could arise if not enough acid was added to the iron solution before the titration was started. This would allow much of the permanganate to go to MnO2 (s) rather than to Mn2 , leading to more permanganate needed for the titration. How would this affect the % of iron found at the end of the experiment

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The answer is falsegravitational force is independent of medium and depends only on the masses of the two objects and the distance between them.

The reaction 2kalsi3o8 + 2(h+ + hco3-) + h2o  →  al2si2o5(oh)4 + 2k+ + 2hco3- + 4sio2 shows that feldspar kalsi3o8 is chemically altered by hydrolysis to form chalky-looking clay mineral kaolinite al2si2o5(oh)4. the chemical breakdown of potassium feldspar due to exposure to acidic water results to the mineral binding with the water molecule to become kaolinite with silica and potassium and bicarbonate ions in solution.