احسب كمية الملح في كل محلول: (250 مل * 20%) + (750 مل * 5%) = 50 مل + 37.5 مل = 87.5 مل.

["How to Calculate Salt Concentration in Solutions: A Simple Guide", "Understanding how to calculate the total amount of salt in mixed solutions is essential in both everyday cooking and scientific applications. Whether you're preparing a saline solution for medical use, adjusting flavors in recipes, or studying solutions in chemistry, knowing the salt concentration in mixed volumes is key. Today, we’ll break down a common calculation example and explain the science behind it.", "### What Does the Calculation Represent?\nThe expression (250 مل * 20%) + (750 مل * 5%) = 50 مل + 37.5 مل = 87.5 مل represents a foundational method to determine the total salt volume when combining two separate salt solutions with different concentrations and volumes.", "Here’s what each part means:\n- 250 mL of a 20% salt solution: This means that 20% of 250 milliliters is pure salt.\n- 750 mL of a 5% salt solution: Here, 5% of 750 milliliters contributes salt.", "### Step-by-step Breakdown of the Calculation", "1. Convert percentages to decimals\n - 20% = 0.20\n - 5% = 0.05", "2. Calculate salt volume in each solution\n - First solution (250 mL × 20%):\n ( 250 , \ ext{mL} \ imes 0.20 = 50 , \ ext{mL of salt} )\n - Second solution (750 mL × 5%):\n ( 750 , \ ext{mL} \ imes 0.05 = 37.5 , \ ext{mL of salt} )", "3. Add the salt volumes for the total\n ( 50 , \ ext{mL} + 37.5 , \ ext{mL} = 87.5 , \ ext{mL of salt total} )", "While the final claim “= 87.5 mL” refers to total salt volume in milliliters—note that salt is a solid, so this is actually a volume approximation assuming a density close to water and no volume change on mixing—this method ensures accurate preparation of saline mixtures.", "### Why Accurate Salt Quantification Matters\nMixing solutions with precise salt concentrations is vital for:\n- Healthcare: Preparing sterile saline injections with exact sodium chloride levels is critical for medical safety.\n- Culinary Arts: Chefs rely on accurate salt measurements to balance flavors without risking spoilage or over-salting.\n- Science Labs: Accurate dilutions are foundational for chemical experiments and solution testing.", "### Tips for Practical Applications\n- Always convert percentages to decimals before calculation.\n- When mixing solutions, ensure units (mL, % by volume, etc.) are consistent.\n- For precision-critical settings, use calibrated measuring equipment and record all volumes accurately.\n- Remember that salt concentration by mass gives more accurate results — volume-based calculations assume the density of the solution approximates water, which works well for dilute solutions.", "### Conclusion\nKnowing how to calculate the total salt content in mixed solutions empowers better control over flavor, safety, and scientific integrity. Whether you’re diluting a saline wash or adjusting a recipe, applying this simple volume-weighted method ensures accuracy. Next time you combine two solutions, apply decimal conversions and summing volumes to get reliable results every time.", "By mastering these calculations, you’re well-equipped to tackle practical challenges in kitchens, laboratories, and beyond!"]