There are impurities and added chemicals in tap water that may alter the sample testing result.
The sample that has the largest surface area will dissolve the fastest in dilute hydrochloric acid because more surface area allows for more contact between the sample and the acid, increasing the rate of dissolution.
A powdered sample would dissolve the fastest when placed in a container of dilute hydrochloric acid. The increased surface area of the particles allows for more interactions between the sample and the acid, leading to faster dissolution.
Dissolve a small sample in nitric acid; the color of the solution become blue.
Milk. In milk, the proteins are too large to dissolve. They are actually suspended within the solution.
To prepare a dry sample of silver chloride, dissolve silver nitrate in water and add hydrochloric acid to form a white precipitate of silver chloride. Filter the precipitate, wash it with distilled water, and then dry it in an oven or desiccator to remove any remaining water.
# Dissolve 1.32g of sodium citrate in 85ml of distilled water # Dissolve 0.48g of citric acid in the solution from step 1 # Dissolve 1.47g of dextrose in the solution from step 2 # Add distilled water to 100ml # Filter sterilize through 0.2um filter # Use 0.25ml of solution for 1ml of blood Acts as an anti-coagulant. Not taking credit for this answer, but worked for me.
Simple answer is that the sample is soluble in water. The primary reason to use distilled water is to maintain the purity of the sample. Municipal water is treated with chlorine to prevent bacterial growth, plus the water picks up traces of metal from the pipes, valves and tanks it travels through on the way to your faucet.
2 → 4 → 1 → 3 → 5 Make a prediction of which liquid will freeze first.→ Fill two beakers with 250 mL of distilled water.→Dissolve 30 grams of salt in one of the beakers.→Place both beakers in a freezer and observe which liquid freezes first.→Write a report on his findings.
A random sample is a sample that is collected without any specific characteristics in mind. For instance, instead of collecting a sample of women or members of a particular age group, they are collected randomly off the streets.
To dilute a urine sample, you can mix it with distilled water or a diluent solution in a clean container. The amount of diluent added will depend on the desired dilution ratio. Make sure to mix the sample thoroughly before testing.
because its faster and then when you use a sample you can easily make accurate predictions about what would/will happen next
To get a sample of soluble salt, you can dissolve the salt in water, filter out any impurities, then evaporate the water to leave behind the salt crystals. This will give you a pure sample of the soluble salt.