MLT 110 Exam 2

A noncritical measurement can be:

made using a volumetric flask

made using a volumetric pipet

made using an Erlenmeyer flask

used when making a standard

made using an Erlenmeyer flask

An autoclave usually operates at 121 ^°C and ____________________ psi.

15 psi

Glassware with chips or cracks:

can be repaired with Super Glue

is not a safety hazard

should be discarded

should be used only for noncritical measurements

should be discarded

Urinalysis samples are usually spun in a ____________________.

centrifuge

All of the following are true concerning laboratory balances EXCEPT:

The weighing pan should be cleaned once a day.

They should be checked with known weights at intervals.

They should be installed where they do not get bumped and jarred.

They should not be installed in front of a window that can be opened.

The weighing pan should be cleaned once a day.

used to estimate volumes

beakers or Erlenmeyer flasks

used to determine the alkalinity or acidity of a solution

pH meter

used to store samples and reagents at controlled temperature

Refrigerator

used to weigh laboratory chemicals

analytic balancer

instrument used to sterilize contaminated supplies

autoclave

When 360 grams of glucose is added to in water to make final volume as 2L. 

What is the molarity of the solution. (GMV of glucose : 180mg)

1M

A 0.85% saline(NaCl) solution is:

8.5 g saline(NaCl) in 100 mL of water

85 g of saline(NaCl) made up to 1,000 mL of water

0.85 g saline(NaCl) made up to 100 mL of water

8.5 mL of saline(NaCl) added to 91.5 mL of water

0.85 g saline(NaCl) made up to 100 mL of water

A solution containing 1 mole of solute per liter of solution is a(n) ______________.

molar solution

In a serial dilution, a sample is diluted a series of times by the same dilution factor.

True

False

true

When 2 g of glucose is added to 100 mL of water, which of the following is true?

It is a w/v solution.

It is a v/v solution.

It is a 2 M solution.

It is a w/w solution.

It is a w/v solution

an expression of concentration and refers to the volume or number of parts of the substance to be diluted in the total volume, or parts, of the final solution.

dilution

What are a series of dilutions in which all dilutions, including or following the first one, are the same….called?

serial dilutions

What is the formula for moles per liter solution?

m = n/v { moles = # of moles / volume (Liters)}

What is the unit for mole per liter?

mol/L

How would you make 350mL of a 0.20mol/L solution of sulphuric acid from a 18mol/L stock solution? solve for the final volume.

3.9mL

The number of moles of solute per kilogram of solvent is called?

Molality

C1V1=C2V2 is the formula for?

Dilution

The gram molecular mass (or weight) of a compound per liter of solution is called

Molarity

What’s the number of osmoles of solute per kilogram of solvent called?

Osmolality

What’s the number of osmoles of solute per liter of solution called?

Osmolarity

-rity correlates to (osmolarity and molarity)

liters

-lity correlates to (osmolity and molality)

kilograms

What are the two types of ware in the lab?

Plastic and glassware