Beyond Labz

• Balance.  The simulated balance is modeled after a typical analytical balance with a mass resolution of 0.2 mg. Items (beakers, weighing paper, and solids) can be weighed by dragging and dropping the item on the balance. The balance has a maximum capacity of 200 g. The Tare button can be used to tare or zero out the balance.
• Weigh Paper.  A piece of weighing paper can be dragged from the stack of papers to either the balance or to the lab bench. Solid can be transferred from the reagent bottle to the weighing paper in the balance for weighing or onto the weighing paper on the bench top. Any solid on a weighing paper can be dragged and dropped into the beaker.
• Beaker. An empty beaker or one with a solution or water can be placed in the balance area for weighing. The balance area is the only location in the simulated laboratory where solid can be taken from a reagent bottle and then transferred either to a weighing paper or to a beaker. Note that solid can also be transferred directly to the beaker while the beaker is on the balance.
• Scoop.  The scoop is used to transfer solid from the reagent bottle to either a weighing paper or to the beaker. The scoop is used by clicking on the scoop and dragging it to the mouth of the reagent bottle (with the lid off), and then hold the scoop down above the bottle where it will cycle through on of the five scoop sizes shown on the bottle label. Move the scoop away from the bottle when the desired size is selected. After solid is on the scoop, it can then be dropped on a weighing paper or on the beaker. An alternate and perhaps easier method for loading the scoop is to click and hold on one of the scoop levels on the side of the bottle, which will then automatically load the scoop with the indicated amount of solid.
• Solid Reagent Bottles.  Solid reagents must be placed in the balance area before solid can be transferred to a beaker. The balance area is the only location where solids can be transferred from the solid reagent bottles. When a bottle is placed in the balance area, the bottle lid is still on but can be removed by clicking on the lid. The lid can be replaced by clicking on the mouth of the jar. The bottle label, while in the balance area, shows scoops with five different amounts of solids. These are used to determine the amount of solid to place on the scoop.
• Disposal Bucket.  The disposal bucket is used to dispose of weighing paper, the beaker, or to dispose of the contents of the bomb cup. Note that if the beaker is dropped on the disposal bucket, the beaker and its contents will be discarded.
• X Button.  Clicking on the X in the upper right corner of the window will return the user to the regular laboratory view.

Weighing Solids. In the titration simulation, solids are weighed using the following sequence: (1) Place a solid reagent bottle and a beaker in the balance area and then click on the balance to zoom in. (2) Place either the beaker or a weighing paper on the balance and then Tare the balance. (3) Click on the reagent bottle lid to open it. (4) Click and drag on the scoop and place it "in" the bottle and then hold the scoop in place while it cycles through the five scoop sizes shown on the bottle lab. Move the scoop away from the bottle when the desired size is selected. An alternate and perhaps easier method for loading the scoop is to click and hold on one of the scoop levels on the side of the bottle, which will then automatically load the scoop with the indicated amount of solid. (5) Now drag the scoop to the beaker or weighing paper on the balance until it snaps in place and drop the solid. (6) Repeat the scooping step as necessary to measure out the necessary quantity of solid. (7) If a weighing paper was used to weigh out the solid, drag the weighing paper with solid to the beaker and drop it to transfer the solid.