how do i do this \?
a 4.0mg/dl standard solution is needed. To prepare 100ml of the working standard. How much stock standard of a 1mg/ml (100mg/dl) solution is needed.
i don't understand this conceptually /
thanks
I don't get it either. Perhaps if you wrote all of the question and used proper punctuation the question might make sense.
problem 2
copies straight from my notes
a 4.0mg/dL standard solution is needed. To prepare 100mL of the working standard, how much stock standard of a 1mg/mL solution is neeeded ?
i emailed her:I didn\t know what is a stock standard , working etc.
Stock standard is a standard prepared from manufacturer which is the most concentrated solution. It is then diluted to make a working standard in the lab. That working standard will be used as a standard to calibrate instrument or used for the experiment. It will become clearer after next week's lab. We'll be making serial dilution from a stock standard next week.
So in other words, the question is asking how many ml of stock standard with a concentration of 1 mg/ml needed to make 100 ml of 4.0 mg/dl concentration working standard.
thanks
To understand this conceptually, let's break down the problem into steps:
1. The problem states that a 4.0 mg/dl standard solution is needed. This is the concentration of the working standard solution that you need to prepare.
2. The problem also states that you have a stock standard solution with a concentration of 1 mg/ml (100 mg/dl). This is the concentration of the stock solution that you have.
3. You need to prepare 100 ml of the working standard solution. This is the final volume of the solution that you will have.
4. Now, let's determine how much of the stock standard solution is needed to prepare the working standard solution. To do this, we need to use the equation:
(Concentration of Stock Solution) × (Volume of Stock Solution) = (Concentration of Working Solution) × (Volume of Working Solution)
Let's substitute the values we have:
(1 mg/ml) × Volume of Stock Solution = (4.0 mg/dl) × (100 ml)
Now, we can solve for the Volume of Stock Solution:
Volume of Stock Solution = ((4.0 mg/dl) × (100 ml)) / (1 mg/ml)
5. Calculating the equation, we get:
Volume of Stock Solution = 400 ml
Therefore, you would need 400 ml of the stock standard solution to prepare 100 ml of the working standard solution.
I hope this helps clarify the concept for you. Let me know if you have any further questions!
To understand this conceptually, let's break it down step by step:
1. Firstly, we need to understand the desired concentration of the working standard solution. The problem states that we need a 4.0mg/dL concentration.
2. Next, we have the stock standard solution with a concentration of 1mg/mL (100mg/dL). This means that for every milliliter of the stock solution, there is 1mg of the solute present.
3. Now, we need to determine the volume of the stock solution that we should take to prepare the working standard. We can use the formula:
Volume of stock solution = (Desired concentration * Desired volume) / Stock concentration
plugging in the values, we get:
Volume of stock solution = (4.0mg/dL * 100mL) / 100mg/dL
4. Canceling out the units, we're left with:
Volume of stock solution = (4 * mL) / 1
Simplifying, we get:
Volume of stock solution = 4mL
Therefore, to prepare 100mL of the working standard solution with a concentration of 4.0mg/dL, you would need 4mL of the stock standard solution.