Solution Dilution Calculator vs Film Process Timer

The Solution Dilution Calculator calculates the volume of stock concentrate needed to achieve a specified volume and concentration. It uses the formula: C₁V₁ = C₂V₂ where: C₁ = Initial concentration (stock solution) V₁ = Volume to be removed (aliquot) from the stock solution C₂ = Final concentration of the diluted solution V₂ = Final volume of the diluted solution (after dilution with the solvent) Designed for both teaching and research laboratories, this calculator can be used for dilution calculations with solutions expressed in mass per volume (e.g., g/L, mg/mL) or weight per volume (e.g., % w/v) concentration units. Example Dilution Calculation: Question: What volume of a 10 mM stock solution is required to prepare 20 mL of a 50 μM solution? Solution: Using the equation C₁V₁ = C₂V₂, where: C₁ = 10 mM C₂ = 50 μM V₂ = 20 mL V₁ = Unknown Steps: Enter 10 into the Concentration (start) box and select millimolar (mM). Enter 50 into the Concentration (final) box and select micromolar (μM). Enter 20 into the Volume (final) box and select milliliters (mL). The result, 100 microliters (0.1 mL), will appear automatically. Thank you for your support! Stay tuned for more updates.

A film developing timer, with a darkroom color scheme mode where the colors are predominately red hues. It features the ability to create multiple timers, with multiple steps. The timers can be - Grouped in to categories or types - Duplicated - Set to show notification on the Home Screen (if notifications are enabled) - Marked as a favourite for easier access Some predefined timers are available with the free version of the app. These are not modifiable. Steps within timers can be - Up to 24 hours - Easily reordered (drag and drop) - Duplicated - Run automatically or manually (first step always has to be started manually) - Set up to make sound tone periodically. Running a timer shows - Current step information - Remaining time for the current step - Information for the next step - Progress of the process - Remaining time for the process - Selecting the darkroom color mode The user can select options to - Run the app in light or dark mode - Use the darkroom mode color scheme - Enable sounds (off, essential and all) - Change the color of the timer - Enable / Disable the display of the predefined timers. If you have multiple devices you synchronise your timer definitions between devices using iCloud (if available). In the free version of the app you can add a timer with 5 steps, and there are some predefined timers and a small set of color schemes. In the paid version you can have as many timers as your device allows, each with unto 50 steps, additional predefined timers are available and an expanded range of color schemes.