Test tube holder

Holder, test tube tubes or long-stem disposable... 

Cylinder, graduated, 10 mL Goggles, safety Holder, test tube... 

Proceed as follows for both solid and liquid compounds. By means of a test-tube holder, hold the tube in a horizontal position, and by means of a small flame gently heat the mixture at the open end. Increase the size of the flame gradually until the mixture is red-hot at this end. Now slowly and cautiously extend the heating towards the closed end until the whole of the mixture is red-hot. (If during the extension of the heating, the mixture tends to be pushed out of the tube by the evolution of gas, stop the heating momentarily, and rotate the... 

Reagierglas, n. test tube, -biirste, /. test-tube brush, -gestell, n. test-tube stand, -halter, m. test-tube holder. 

Dispose of the waste material in a waste container in the fume hood as instructed by your teacher. CAUTION Use a test-tube holder to move the test tube. 

Let us dwell on Figure 6.4 for a moment. The standards and sample solutions are introduced to the instrument in a variety of ways. In the case of a pH meter and other electroanalytical instruments, the tips of one or two probes are immersed in the solution. In the case of an automatic digital Abbe refractometer (Chapter 15), a small quantity of the solution is placed on a prism at the bottom of a sample well inside the instrument. In an ordinary spectrophotometer (Chapters 7 and 8), the solution is held in a round (like a test tube) or square container called a cuvette, which fits in a holder inside the instrument. In an atomic absorption spectrophotometer (Chapter 9), or in instruments utilizing an autosampler, the solution is sucked or aspirated into the instrument from an external container. In a chromatograph (Chapters 12 and 13), the solution is injected into the instrument with the use of a small-volume syringe. Once inside, or otherwise in contact with the instrument, the instrument is designed to act on the solution. We now address the processes that occur inside the instrument in order to produce the electrical signal that is seen at the readout. 

Materials salicylic acid, methanol, distilled water, 10-mL graduated cylinder, Beral pipette, 250-mL beaker, concentrated sulfuric acid, top or bottom of a petri dish, cotton ball, small test tube, balance, weighing paper, hot plate, test-tube holder... 

Record the colour of the liquid mixture in the fourth test tube. Use a test tube holder to immerse this test tube in the hot-water bath. Record any colour change. 

Initialize Robot and Peripherals Pick up Sample Container from Holder Tare Sample Container Remove Sample from Test Tube Dispense Sample in Container Weigh Sample... 

STRIP OF THIN CARDBOARD MAKES AN ADEQUATE TEST TUBE HOLDER. IF YOU LIKE, YOU CAN MAKE A HOLDER FROM CLOTHES HANGER WIRE AS SHOWN HERE. 

WHEN HEATING A LIQUID IN A TEST TUBE, HOLD TUBE WITH A HOLDER. KEEP THE TUBE MOVING. DO NOT HEAT BOTTOM OF TUBE—CONTENTS MAY "BUMP" AND SQUIRT OUT. NEVER POINT MOUTH OF TEST TUBE TOWARD YOURSELF OR TOWARD ANYONE ELSE. 

For each student group 14.65 g NaC2H302 (sodium acetate) three large test tubes test tube holder Bunsen burner or alcohol lamp matches Celsius thermometer distilled water red or blue powdered paint pigment stirring rod test tube rack 10.0 ml graduated cylinder centigram balance paintbrushes 5-x-7-in. watercolor paper. 

Test tube holder 2.1 Test tube rack 2.1... 

Hold a small strip of moist pH paper over the mouth of the test tube note any changes in color record the pH reading. Remove the test tube from the water bath, holding it in a test tube holder. Carefully note any odor. 

Place the test tube in a test tube holder. Immerse the test tube in the sand bath. Make sure the test tube points away from your face. (Caution Do not touch either the test tube or the beaker with your hand.) Heat the mixture in the test tube to about 140°C. The mixture will turn yellow. 

Burner, Bunsen Burner, ring P. 48 Burner, wingtop Casserole, 150 cc. P. 48, 52, 55 Casserole, 750 cc. P. 1, 55 Clamp, burette, small Clamp, test tube holder... 

Standard safety equipment is a must eye or face protection, thermal gloves, lab coat, and closed-toed shoes should all be worn. Tongs, tweezers, or test tube holders should be used to transport heated containers. 

Be sure to hold the test tube with a proper test tube holder. Do not use... 

Determination of electrochemical series test tubes and holder rack, beakers, graduated cylinder, forceps... 

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