# Laboratory Techniques and Measurements

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Laboratory Techniques and Measurements
Laboratory Techniques and Measurements

Choose any three objects that are shorter than the metric ruler to measure, such as a CD, Key, spoon etc.

OBJECT | LENGTH (cm) | LENGHTH (mm) | ruler | 30.5 cm | 305 mm | thermometer | 15.1 cm | 151 mm | pencil | 16.7 cm | 167 mm |

Warm Temperature Measurements

* Fill a 100 a 100mL beaker with 50mL of hot water. Get the water as hot as possible. * Use thermometer to measure the temperature of the water in the beaker using Celsius unit. Record measurement in Data Below. * Place the beaker of the water on the wire gauze burner stand. * Remove the cap from the burner fuel and set aside. Light the fuel and slip it under the burner stand. * Bring the water to full boil and record its temperature. Record the measurement in data below. * Let the water boil for about 5 minutes. Record the measurement in data below.

Cold Temperature Measurements * Allow the 100 mL beaker to cool. Fill the beaker with cold tap water and then record for the water temperature Data below. * Prepare an ice water bath by adding ice to the beaker filled with cold tap water. * Immerse the thermometer in the ice bath and stir gently. Record the temperature Data below. * Let the ice water stand about 5 minutes. Then record the temperature in Data below. Hot water from tap (Celsius) | Boiling Water (Celsius) | Boiling water- 5 min | 51 | 103 | 103 | Cold water from tap(Celsius) | Ice water (Celsius) | Ice water-5 min | 5 | 0 | -2 | Volume Measurement * The curved surface of the lid in a glass is cylinder is called the meniscus. * Fill a small test tube with water. * Pour the water from the test tube into the 25 mL graduated Cylinder. Record the volume of the water below. Empty the graduated cylinder. * Determine the volume of a thin –stemmed pipet: a) Completely fill a clean, empty pipet with water. b) Hold the pipet vertically multiple times to expel