Answer:
<u><em>Volume of NaOH, aka V2 = 6.32 mL to 3 sig. fig.</em></u>
A chemistry student weighs out 0.0941 g of hypochlorous acid (HClo) into a 250. ml. volumetric flask and dilutes to the mark with distilled water. He plans to titrate the acid with 0.2000 M NaOH solution. Calculate the volume of NaOH solution the student will need to add to reach the equivalence point. Round your answer to 3 significant digits mL.
Explanation:
1 mole HClO = 74.44g
0.0941g =
= 0.00126 moles
Concentration = no. of moles/volume in L
Hence, Concentration of HClO = 0.00126/ 0.250L
= 0.005M.
C1V1 =C2V2
0.005 × 250 mL = 0.2 × V2
<u><em>Volume of NaOH, aka V2 = 6.32 mL to 3 sig. fig.</em></u>
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A wet barometer puts a vacuum above a liquid and applies air pressure to the surface of the liquid - the height of the liquid above to reservoir surface is the measure of air pressure. The liquid can be in a J tube with an open end or a straight tube in a pool. Air pressure will support about 30" of mercury or about 32 feet of water.
<span>A dry barometer uses a sealed chamber with a diaphragm with a lever touching it or a spiral tube with a link connected to a display needle. In the former, the slight movement of the diaphragm with changed pressure is translated to a large movement of the end of the lever movement across the scale. In the spiral, the expanding/contracting air inside the tube changes its shape and pulls the needle over. </span>
<span>In both case, the scale of pressure for the needle has to be calibrated to the design. </span>
<span>- </span>
<span>How Tropical Cyclones are Observed </span>
<span>* Direct measurements of tropical storm and hurricane dimensions and wind speeds are taken primarily by reconnaissance </span>
<span>aircraft, although ships and buoys also take important measurements. Once a hurricane is near and/or on land, Automated </span>
<span>Surface Observation Systems (ASOS) provide surface conditions, and radio sondes take upper air measurements. </span>
<span>* Indirect observational methods include satellite imagery and Doppler radar. In particular, satellites have greatly improved </span>
<span>our ability to monitor and understand hurricanes. Radar data are important once the storm comes close to shore </span>
<span>and after landfall for forecasting hurricane-related weather. </span>
<span>I hope this is helpful.</span>